diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 42f772a57a..f0bf1d6371 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -524,8 +524,9 @@ message DeleteEntryRequest {
     bool ignore_recursive_error = 6;
     bool is_from_other_cluster = 7;
     repeated int32 signatures = 8;
-    int64 if_not_modified_after = 9;
+    int64 if_not_modified_after = 9;    // unix time in seconds
     bool keep_remote_object = 10;
+    int64 if_not_modified_after_ns = 11; // unix time in nanoseconds; overrides if_not_modified_after when set
 }
 
 message DeleteEntryResponse {
diff --git a/weed/filer/empty_folder_cleanup/empty_folder_cleaner.go b/weed/filer/empty_folder_cleanup/empty_folder_cleaner.go
index b85b94d20f..a917515ff9 100644
--- a/weed/filer/empty_folder_cleanup/empty_folder_cleaner.go
+++ b/weed/filer/empty_folder_cleanup/empty_folder_cleaner.go
@@ -52,7 +52,7 @@ type deletedFolder struct {
 // FilerOperations defines the filer operations needed by EmptyFolderCleaner
 type FilerOperations interface {
 	CountDirectoryEntries(ctx context.Context, dirPath util.FullPath, limit int) (count int, err error)
-	DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32, ifNotModifiedAfter int64) error
+	DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32, notModifiedAfter time.Time) error
 	GetEntryAttributes(ctx context.Context, p util.FullPath) (attributes map[string][]byte, err error)
 	IsDirectoryKeyObject(ctx context.Context, p util.FullPath) (bool, error)
 	DirectoryAttributes(ctx context.Context, p util.FullPath) (DirectoryAttributes, error)
@@ -656,7 +656,7 @@ func (efc *EmptyFolderCleaner) countItems(ctx context.Context, folder string) (i
 
 // deleteFolder deletes an empty folder
 func (efc *EmptyFolderCleaner) deleteFolder(ctx context.Context, folder string) error {
-	return efc.filer.DeleteEntryMetaAndData(ctx, util.FullPath(folder), false, false, false, false, nil, 0)
+	return efc.filer.DeleteEntryMetaAndData(ctx, util.FullPath(folder), false, false, false, false, nil, time.Time{})
 }
 
 func (efc *EmptyFolderCleaner) getBucketCleanupPolicy(ctx context.Context, folder string) (bucketPath string, autoRemove bool, source string, attrValue string, err error) {
diff --git a/weed/filer/empty_folder_cleanup/empty_folder_cleaner_test.go b/weed/filer/empty_folder_cleanup/empty_folder_cleaner_test.go
index bf673b630e..6e9aabcde3 100644
--- a/weed/filer/empty_folder_cleanup/empty_folder_cleaner_test.go
+++ b/weed/filer/empty_folder_cleanup/empty_folder_cleaner_test.go
@@ -42,7 +42,7 @@ func (m *mockFilerOps) CountDirectoryEntries(_ context.Context, dirPath util.Ful
 	return m.countFn(dirPath)
 }
 
-func (m *mockFilerOps) DeleteEntryMetaAndData(_ context.Context, p util.FullPath, _, _, _, _ bool, _ []int32, _ int64) error {
+func (m *mockFilerOps) DeleteEntryMetaAndData(_ context.Context, p util.FullPath, _, _, _, _ bool, _ []int32, _ time.Time) error {
 	if m.deleteFn == nil {
 		return nil
 	}
diff --git a/weed/filer/filer_delete_collection_test.go b/weed/filer/filer_delete_collection_test.go
index 9701f38710..3300d8324c 100644
--- a/weed/filer/filer_delete_collection_test.go
+++ b/weed/filer/filer_delete_collection_test.go
@@ -155,7 +155,7 @@ func TestDeleteEntryMetaAndDataDeletesCollectionWhenTheRequestIsCancelledMidDele
 	// The client hangs up just as the bucket entry comes out of the store.
 	store.onDeleteEntry = func(util.FullPath) { cancel() }
 
-	if err := f.DeleteEntryMetaAndData(ctx, bucketPath, true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(ctx, bucketPath, true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 	if ctx.Err() == nil {
@@ -205,7 +205,7 @@ func TestDeleteBucketKeepsSharedCollection(t *testing.T) {
 	seedBucket(t, store, util.FullPath("/buckets/a"))
 	seedBucket(t, store, util.FullPath("/buckets/b"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -230,7 +230,7 @@ func TestDeleteBucketNamedAfterSharedCollection(t *testing.T) {
 	seedBucket(t, store, util.FullPath("/buckets/shared"))
 	seedBucket(t, store, util.FullPath("/buckets/other"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/shared", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/shared", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -255,7 +255,7 @@ func TestDeleteBucketKeepsCollectionUsedByNonBucketPath(t *testing.T) {
 	})
 	seedBucket(t, store, util.FullPath("/buckets/a"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -276,7 +276,7 @@ func TestDeleteBucketKeepsCollectionFromBroadRule(t *testing.T) {
 	})
 	seedBucket(t, store, util.FullPath("/buckets/a"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -298,7 +298,7 @@ func TestDeleteBucketKeepsDefaultCollection(t *testing.T) {
 	})
 	seedBucket(t, store, util.FullPath("/buckets/a"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -325,7 +325,7 @@ func TestDeleteBucketKeepsCollectionFromNestedSiblingRule(t *testing.T) {
 	seedBucket(t, store, util.FullPath("/buckets/a"))
 	seedBucket(t, store, util.FullPath("/buckets/b"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -348,7 +348,7 @@ func TestDeleteBucketUnderFilerGroup(t *testing.T) {
 	})
 	seedBucket(t, store, util.FullPath("/buckets/photos"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/photos", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/photos", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
@@ -372,7 +372,7 @@ func TestDeleteBucketDeletesResolvedCollection(t *testing.T) {
 	})
 	seedBucket(t, store, util.FullPath("/buckets/only"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/only", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/only", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
diff --git a/weed/filer/filer_delete_entry.go b/weed/filer/filer_delete_entry.go
index 899d337c05..2d82d532f0 100644
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@@ -117,7 +117,7 @@ func deleteEventEntry(ctx context.Context, entry *Entry) *Entry {
 type OnChunksFunc func([]*filer_pb.FileChunk) error
 type OnHardLinkIdsFunc func([]HardLinkId) error
 
-func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32, ifNotModifiedAfter int64) (err error) {
+func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32, notModifiedAfter time.Time) (err error) {
 	if p == "/" {
 		return nil
 	}
@@ -128,7 +128,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	if findErr != nil {
 		return findErr
 	}
-	if ifNotModifiedAfter > 0 && entry.Attr.Mtime.Unix() > ifNotModifiedAfter {
+	if !notModifiedAfter.IsZero() && entry.Attr.Mtime.After(notModifiedAfter) {
 		return nil
 	}
 	if !isRecursive && entry.IsDirectory() {
diff --git a/weed/filer/filer_delete_entry_test.go b/weed/filer/filer_delete_entry_test.go
index 7a049fade4..d483b7a779 100644
--- a/weed/filer/filer_delete_entry_test.go
+++ b/weed/filer/filer_delete_entry_test.go
@@ -55,12 +55,12 @@ func TestKeepRemoteObjectMarkerOnlyLivesOnDeleteEvents(t *testing.T) {
 	require.Contains(t, stored.Extended, "Seaweed-Other")
 
 	ordinaryCtx, ordinary := WithMetadataEventSink(ctx)
-	require.NoError(t, f.DeleteEntryMetaAndData(ordinaryCtx, file.FullPath, false, false, false, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(ordinaryCtx, file.FullPath, false, false, false, false, nil, time.Time{}))
 	require.False(t, IsMetadataOnlyDelete(ordinary.Last().EventNotification.OldEntry))
 
 	require.NoError(t, f.CreateEntry(ctx, &Entry{FullPath: file.FullPath, Attr: Attr{Mode: 0644}}, nil, false, false, nil, true, 255))
 	keepCtx, keep := WithMetadataEventSink(WithKeepRemoteObject(ctx))
-	require.NoError(t, f.DeleteEntryMetaAndData(keepCtx, dir.FullPath, true, false, false, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(keepCtx, dir.FullPath, true, false, false, false, nil, time.Time{}))
 	require.Equal(t, "dir", keep.Last().EventNotification.OldEntry.Name)
 	require.True(t, IsMetadataOnlyDelete(keep.Last().EventNotification.OldEntry))
 }
@@ -83,7 +83,7 @@ func TestDeleteFolderFreesLastHardLinkChunks(t *testing.T) {
 	}
 	require.NoError(t, f.CreateEntry(ctx, linkEntry, nil, false, false, nil, true, 255))
 
-	require.NoError(t, f.DeleteEntryMetaAndData(ctx, "/d", true, false, true, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, "/d", true, false, true, false, nil, time.Time{}))
 
 	_, err := store.KvGet(ctx, hardLinkId)
 	require.ErrorIs(t, err, ErrKvNotFound)
@@ -111,9 +111,61 @@ func TestDeleteFolderKeepsSharedHardLinkChunks(t *testing.T) {
 		}, nil, false, false, nil, true, 255))
 	}
 
-	require.NoError(t, f.DeleteEntryMetaAndData(ctx, "/d", true, false, true, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, "/d", true, false, true, false, nil, time.Time{}))
 
 	_, err := store.KvGet(ctx, hardLinkId)
 	require.NoError(t, err, "surviving link must keep the inode record")
 	require.Equal(t, 0, f.pendingDeletionCount())
 }
+
+func TestDeleteEntryMetaAndData_IfNotModifiedAfterSubsecond(t *testing.T) {
+	store := newStubFilerStore()
+	f := newTestFiler(t, store, NewFilerRemoteStorage())
+	ctx := context.Background()
+
+	baseTime := time.Date(2026, 10, 26, 12, 0, 0, 500_000_000, time.UTC) // 12:00:00.500
+	filePath := util.FullPath("/subsecond.txt")
+
+	entry := &Entry{
+		FullPath: filePath,
+		Attr:     Attr{Mode: 0644, Mtime: baseTime},
+	}
+	require.NoError(t, f.CreateEntry(ctx, entry, nil, false, false, nil, true, 255))
+
+	// Guard is 100ms before entry Mtime (within the same second)
+	guardNs := baseTime.Add(-100 * time.Millisecond).UnixNano()
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, filePath, false, false, false, false, nil, time.Unix(0, guardNs)))
+
+	// Entry must NOT be deleted because entry's Mtime is newer than guardNs
+	stored, err := f.FindEntry(ctx, filePath)
+	require.NoError(t, err)
+	require.NotNil(t, stored, "entry modified after guardNs must be preserved")
+
+	// Guard is at or after entry Mtime
+	olderGuardNs := baseTime.Add(100 * time.Millisecond).UnixNano()
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, filePath, false, false, false, false, nil, time.Unix(0, olderGuardNs)))
+
+	// Entry must be deleted now
+	_, err = f.FindEntry(ctx, filePath)
+	require.ErrorIs(t, err, filer_pb.ErrNotFound)
+
+	// A guard equal to the entry's Mtime still deletes
+	require.NoError(t, f.CreateEntry(ctx, entry, nil, false, false, nil, true, 255))
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, filePath, false, false, false, false, nil, baseTime))
+	_, err = f.FindEntry(ctx, filePath)
+	require.ErrorIs(t, err, filer_pb.ErrNotFound)
+
+	// An entry mtime beyond the UnixNano range compares as a time, not an int
+	farFuture := &Entry{FullPath: filePath, Attr: Attr{Mode: 0644, Mtime: time.Date(3000, 1, 1, 0, 0, 0, 0, time.UTC)}}
+	require.NoError(t, f.CreateEntry(ctx, farFuture, nil, false, false, nil, true, 255))
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, filePath, false, false, false, false, nil, baseTime))
+	stored, err = f.FindEntry(ctx, filePath)
+	require.NoError(t, err)
+	require.NotNil(t, stored, "entry past the UnixNano range must be preserved")
+
+	// A whole-second cutoff beyond the UnixNano range still matches: the
+	// unchanged year-3000 entry is at its guard's second, so it is deleted
+	require.NoError(t, f.DeleteEntryMetaAndData(ctx, filePath, false, false, false, false, nil, time.Unix(farFuture.Attr.Mtime.Unix(), 999_999_999)))
+	_, err = f.FindEntry(ctx, filePath)
+	require.ErrorIs(t, err, filer_pb.ErrNotFound)
+}
diff --git a/weed/filer/filer_lazy_remote_test.go b/weed/filer/filer_lazy_remote_test.go
index f463bb618c..05d3105077 100644
--- a/weed/filer/filer_lazy_remote_test.go
+++ b/weed/filer/filer_lazy_remote_test.go
@@ -551,7 +551,7 @@ func TestDeleteEntryMetaAndData_EmptyFolderUnderMountKeepsRemotePrefix(t *testin
 	dirPath := util.FullPath("/buckets/mybucket/dir")
 	putDirEntry(store, string(dirPath))
 
-	require.NoError(t, f.DeleteEntryMetaAndData(context.Background(), dirPath, false, false, false, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(context.Background(), dirPath, false, false, false, false, nil, time.Time{}))
 
 	assert.Empty(t, stub.removeCalls, "an empty local folder must not remove its remote prefix")
 	assert.Nil(t, store.getEntry(string(dirPath)))
@@ -818,7 +818,7 @@ func TestDeleteEntryMetaAndData_GuardedClientRejectsRemoteBackedFile(t *testing.
 		return nil, fmt.Errorf("reject remote endpoint")
 	}
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.Error(t, err, "guarded rejection should block the remote-backed delete")
 	assert.Len(t, stub.deleteCalls, 0, "guarded rejection should not reach the remote")
 }
@@ -854,7 +854,7 @@ func TestDeleteEntryMetaAndData_GuardedClientAllowsLocalOnlyFile(t *testing.T) {
 		return nil, fmt.Errorf("reject remote endpoint")
 	}
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.NoError(t, err, "local-only file should delete despite a rejected mount endpoint")
 	_, findErr := store.FindEntry(context.Background(), filePath)
 	require.ErrorIs(t, findErr, filer_pb.ErrNotFound, "local metadata should be deleted")
@@ -921,7 +921,7 @@ func TestDeleteEntryMetaAndData_RemoteOnlyFileDeletesRemoteAndMetadata(t *testin
 	}
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.NoError(t, err)
 
 	_, findErr := store.FindEntry(context.Background(), filePath)
@@ -961,7 +961,7 @@ func TestDeleteEntryMetaAndData_IsFromOtherClusterSkipsRemoteDelete(t *testing.T
 	f := newTestFiler(t, store, rs)
 
 	// isFromOtherCluster=true simulates a replicated delete from another filer
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, true, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, true, nil, time.Time{})
 	require.NoError(t, err)
 
 	// Local metadata should be deleted
@@ -1018,7 +1018,7 @@ func TestDeleteEntryMetaAndData_UnmountedDirectorySkipsRemoteDelete(t *testing.T
 	_, remoteLoc = f.RemoteStorage.FindMountDirectory(filePath)
 	require.Nil(t, remoteLoc)
 
-	require.NoError(t, f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, true, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, true, false, nil, time.Time{}))
 	require.Len(t, stub.deleteCalls, 0)
 	require.Len(t, stub.removeCalls, 0)
 }
@@ -1051,7 +1051,7 @@ func TestDeleteEntryMetaAndData_RemoteOnlyFileNotUnderMountSkipsRemoteDelete(t *
 	}
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.NoError(t, err)
 	require.Len(t, stub.deleteCalls, 0)
 }
@@ -1079,7 +1079,7 @@ func TestDeleteEntryMetaAndData_RemoteMountWithoutClientResolutionKeepsMetadata(
 	}
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.Error(t, err)
 	require.ErrorContains(t, err, "resolve remote storage client")
 	require.ErrorContains(t, err, string(filePath))
@@ -1118,7 +1118,7 @@ func TestDeleteEntryMetaAndData_LocalDeleteFailurePreservesMetadata(t *testing.T
 	store.deleteErrByPath[string(filePath)] = errors.New("simulated local delete failure")
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.Error(t, err)
 	require.ErrorContains(t, err, "filer store delete")
 	require.Len(t, stub.deleteCalls, 1)
@@ -1157,7 +1157,7 @@ func TestDeleteEntryMetaAndData_RemoteDeleteNotFoundStillDeletesMetadata(t *test
 	}
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.NoError(t, err)
 	_, findErr := store.FindEntry(context.Background(), filePath)
 	require.ErrorIs(t, findErr, filer_pb.ErrNotFound)
@@ -1191,7 +1191,7 @@ func TestDeleteEntryMetaAndData_RemoteDeleteErrorKeepsMetadata(t *testing.T) {
 	}
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{})
 	require.Error(t, err)
 	stored, findErr := store.FindEntry(context.Background(), filePath)
 	require.NoError(t, findErr)
@@ -1272,7 +1272,7 @@ func TestDeleteEntryMetaAndData_RecursiveFolderDeleteRemotesChildren(t *testing.
 	}
 	f := newTestFiler(t, store, rs)
 
-	err := f.DeleteEntryMetaAndData(context.Background(), dirPath, true, false, false, false, nil, 0)
+	err := f.DeleteEntryMetaAndData(context.Background(), dirPath, true, false, false, false, nil, time.Time{})
 	require.NoError(t, err)
 
 	// Child file should have been deleted from remote
diff --git a/weed/filer/filer_remote_tombstone_test.go b/weed/filer/filer_remote_tombstone_test.go
index 6048ae9575..564e50e3c0 100644
--- a/weed/filer/filer_remote_tombstone_test.go
+++ b/weed/filer/filer_remote_tombstone_test.go
@@ -236,7 +236,7 @@ func TestDeleteEntryMetaAndData_TombstonesPath(t *testing.T) {
 		},
 	}
 
-	require.NoError(t, f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, 0))
+	require.NoError(t, f.DeleteEntryMetaAndData(context.Background(), filePath, false, false, false, false, nil, time.Time{}))
 
 	// the deleted path must not resurrect through the lazy fetch even while
 	// the remote object is still present
diff --git a/weed/filer/leveldb2/empty_folder_race_test.go b/weed/filer/leveldb2/empty_folder_race_test.go
index a872676039..782bb4cb0b 100644
--- a/weed/filer/leveldb2/empty_folder_race_test.go
+++ b/weed/filer/leveldb2/empty_folder_race_test.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"os"
 	"testing"
+	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/filer"
 	"github.com/seaweedfs/seaweedfs/weed/filer/empty_folder_cleanup"
@@ -71,7 +72,7 @@ func TestNonRecursiveFolderDeleteKeepsRacingChild(t *testing.T) {
 		}
 	}
 
-	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, 0); err != nil {
+	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, time.Time{}); err != nil {
 		t.Fatalf("delete empty folder: %v", err)
 	}
 
@@ -123,7 +124,7 @@ func TestEnsureDirectoryEntryRestoresRacingParent(t *testing.T) {
 		}
 	}
 
-	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, 0); err != nil {
+	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, time.Time{}); err != nil {
 		t.Fatalf("delete empty folder: %v", err)
 	}
 
@@ -170,7 +171,7 @@ func TestEnsureDirectoryEntryRestoresExactAttributes(t *testing.T) {
 	if err != nil {
 		t.Fatalf("read folder attributes: %v", err)
 	}
-	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, 0); err != nil {
+	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, time.Time{}); err != nil {
 		t.Fatalf("delete folder: %v", err)
 	}
 
@@ -316,7 +317,7 @@ func TestEnsureDirectoryEntryNarrowsAWiderRestore(t *testing.T) {
 	if err != nil {
 		t.Fatalf("read folder attributes: %v", err)
 	}
-	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, 0); err != nil {
+	if err := testFiler.DeleteEntryMetaAndData(ctx, dir, false, false, false, false, nil, time.Time{}); err != nil {
 		t.Fatalf("delete folder: %v", err)
 	}
 
diff --git a/weed/filer/meta_log_collection_test.go b/weed/filer/meta_log_collection_test.go
index aa18d4064e..f5cef78783 100644
--- a/weed/filer/meta_log_collection_test.go
+++ b/weed/filer/meta_log_collection_test.go
@@ -3,6 +3,7 @@ package filer
 import (
 	"context"
 	"testing"
+	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
@@ -125,7 +126,7 @@ func TestBucketCollectionKeepsMetaLogTargetCollection(t *testing.T) {
 	})
 	seedBucket(t, store, util.FullPath("/buckets/a"))
 
-	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, 0); err != nil {
+	if err := f.DeleteEntryMetaAndData(context.Background(), "/buckets/a", true, false, true, false, nil, time.Time{}); err != nil {
 		t.Fatalf("DeleteEntryMetaAndData: %v", err)
 	}
 
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 42f772a57a..f0bf1d6371 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -524,8 +524,9 @@ message DeleteEntryRequest {
     bool ignore_recursive_error = 6;
     bool is_from_other_cluster = 7;
     repeated int32 signatures = 8;
-    int64 if_not_modified_after = 9;
+    int64 if_not_modified_after = 9;    // unix time in seconds
     bool keep_remote_object = 10;
+    int64 if_not_modified_after_ns = 11; // unix time in nanoseconds; overrides if_not_modified_after when set
 }
 
 message DeleteEntryResponse {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 8257c18b8b..dc3517c0fc 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.36.6
-// 	protoc        v7.35.0
+// 	protoc        v3.21.12
 // source: filer.proto
 
 package filer_pb
@@ -2780,8 +2780,9 @@ type DeleteEntryRequest struct {
 	IgnoreRecursiveError bool    `protobuf:"varint,6,opt,name=ignore_recursive_error,json=ignoreRecursiveError,proto3" json:"ignore_recursive_error,omitempty"`
 	IsFromOtherCluster   bool    `protobuf:"varint,7,opt,name=is_from_other_cluster,json=isFromOtherCluster,proto3" json:"is_from_other_cluster,omitempty"`
 	Signatures           []int32 `protobuf:"varint,8,rep,packed,name=signatures,proto3" json:"signatures,omitempty"`
-	IfNotModifiedAfter   int64   `protobuf:"varint,9,opt,name=if_not_modified_after,json=ifNotModifiedAfter,proto3" json:"if_not_modified_after,omitempty"`
+	IfNotModifiedAfter   int64   `protobuf:"varint,9,opt,name=if_not_modified_after,json=ifNotModifiedAfter,proto3" json:"if_not_modified_after,omitempty"` // unix time in seconds
 	KeepRemoteObject     bool    `protobuf:"varint,10,opt,name=keep_remote_object,json=keepRemoteObject,proto3" json:"keep_remote_object,omitempty"`
+	IfNotModifiedAfterNs int64   `protobuf:"varint,11,opt,name=if_not_modified_after_ns,json=ifNotModifiedAfterNs,proto3" json:"if_not_modified_after_ns,omitempty"` // unix time in nanoseconds; overrides if_not_modified_after when set
 	unknownFields        protoimpl.UnknownFields
 	sizeCache            protoimpl.SizeCache
 }
@@ -2879,6 +2880,13 @@ func (x *DeleteEntryRequest) GetKeepRemoteObject() bool {
 	return false
 }
 
+func (x *DeleteEntryRequest) GetIfNotModifiedAfterNs() int64 {
+	if x != nil {
+		return x.IfNotModifiedAfterNs
+	}
+	return 0
+}
+
 type DeleteEntryResponse struct {
 	state         protoimpl.MessageState     `protogen:"open.v1"`
 	Error         string                     `protobuf:"bytes,1,opt,name=error,proto3" json:"error,omitempty"`
@@ -7553,7 +7561,7 @@ const file_filer_proto_rawDesc = "" +
 	"\n" +
 	"entry_name\x18\x02 \x01(\tR\tentryName\x12+\n" +
 	"\x06chunks\x18\x03 \x03(\v2\x13.filer_pb.FileChunkR\x06chunks\"\x17\n" +
-	"\x15AppendToEntryResponse\"\xf9\x02\n" +
+	"\x15AppendToEntryResponse\"\xb1\x03\n" +
 	"\x12DeleteEntryRequest\x12\x1c\n" +
 	"\tdirectory\x18\x01 \x01(\tR\tdirectory\x12\x12\n" +
 	"\x04name\x18\x02 \x01(\tR\x04name\x12$\n" +
@@ -7566,7 +7574,8 @@ const file_filer_proto_rawDesc = "" +
 	"signatures\x121\n" +
 	"\x15if_not_modified_after\x18\t \x01(\x03R\x12ifNotModifiedAfter\x12,\n" +
 	"\x12keep_remote_object\x18\n" +
-	" \x01(\bR\x10keepRemoteObject\"w\n" +
+	" \x01(\bR\x10keepRemoteObject\x126\n" +
+	"\x18if_not_modified_after_ns\x18\v \x01(\x03R\x14ifNotModifiedAfterNs\"w\n" +
 	"\x13DeleteEntryResponse\x12\x14\n" +
 	"\x05error\x18\x01 \x01(\tR\x05error\x12J\n" +
 	"\x0emetadata_event\x18\x02 \x01(\v2#.filer_pb.SubscribeMetadataResponseR\rmetadataEvent\"\xed\x01\n" +
diff --git a/weed/pb/filer_pb/filer_grpc.pb.go b/weed/pb/filer_pb/filer_grpc.pb.go
index 6a2b494a39..8a330ce286 100644
--- a/weed/pb/filer_pb/filer_grpc.pb.go
+++ b/weed/pb/filer_pb/filer_grpc.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.6.2
-// - protoc             v7.35.0
+// - protoc             v3.21.12
 // source: filer.proto
 
 package filer_pb
diff --git a/weed/pb/filer_pb/filer_vtproto.pb.go b/weed/pb/filer_pb/filer_vtproto.pb.go
index ea2d3747aa..437cdab402 100644
--- a/weed/pb/filer_pb/filer_vtproto.pb.go
+++ b/weed/pb/filer_pb/filer_vtproto.pb.go
@@ -2491,6 +2491,11 @@ func (m *DeleteEntryRequest) MarshalToSizedBufferVT(dAtA []byte) (int, error) {
 		i -= len(m.unknownFields)
 		copy(dAtA[i:], m.unknownFields)
 	}
+	if m.IfNotModifiedAfterNs != 0 {
+		i = protohelpers.EncodeVarint(dAtA, i, uint64(m.IfNotModifiedAfterNs))
+		i--
+		dAtA[i] = 0x58
+	}
 	if m.KeepRemoteObject {
 		i--
 		if m.KeepRemoteObject {
@@ -7566,6 +7571,9 @@ func (m *DeleteEntryRequest) SizeVT() (n int) {
 	if m.KeepRemoteObject {
 		n += 2
 	}
+	if m.IfNotModifiedAfterNs != 0 {
+		n += 1 + protohelpers.SizeOfVarint(uint64(m.IfNotModifiedAfterNs))
+	}
 	n += len(m.unknownFields)
 	return n
 }
@@ -16197,6 +16205,25 @@ func (m *DeleteEntryRequest) UnmarshalVT(dAtA []byte) error {
 				}
 			}
 			m.KeepRemoteObject = bool(v != 0)
+		case 11:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field IfNotModifiedAfterNs", wireType)
+			}
+			m.IfNotModifiedAfterNs = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return protohelpers.ErrIntOverflow
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.IfNotModifiedAfterNs |= int64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		default:
 			iNdEx = preIndex
 			skippy, err := protohelpers.Skip(dAtA[iNdEx:])
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 8989e10730..4ae6ece87d 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -618,7 +618,7 @@ func (fs *FilerServer) applyObjectMutation(ctx context.Context, m *filer_pb.Obje
 		if m.KeepRemoteObject {
 			ctx = filer.WithKeepRemoteObject(ctx)
 		}
-		err := fs.filer.DeleteEntryMetaAndData(ctx, fullpath, m.IsRecursive, false, m.IsDeleteData, fromOtherCluster, signatures, 0)
+		err := fs.filer.DeleteEntryMetaAndData(ctx, fullpath, m.IsRecursive, false, m.IsDeleteData, fromOtherCluster, signatures, time.Time{})
 		if err != nil && err != filer_pb.ErrNotFound {
 			return err
 		}
@@ -628,7 +628,7 @@ func (fs *FilerServer) applyObjectMutation(ctx context.Context, m *filer_pb.Obje
 			// transaction. Best-effort: a non-empty or already-removed parent is
 			// the expected no-op, and a failed teardown must not fail the
 			// already-applied delete.
-			parentErr := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(m.Directory), false, false, false, fromOtherCluster, signatures, 0)
+			parentErr := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(m.Directory), false, false, false, fromOtherCluster, signatures, time.Time{})
 			if parentErr != nil && parentErr != filer_pb.ErrNotFound && !errors.Is(parentErr, filer.ErrNonEmptyFolder) {
 				glog.V(1).InfofCtx(ctx, "remove empty parent %s: %v", m.Directory, parentErr)
 			}
@@ -1045,6 +1045,21 @@ func (fs *FilerServer) AppendToEntry(ctx context.Context, req *filer_pb.AppendTo
 	return &filer_pb.AppendToEntryResponse{}, err
 }
 
+// deleteCutoff merges the conditional-delete guards into one cutoff:
+// if_not_modified_after_ns wins when set, and the whole-second
+// if_not_modified_after maps to the last nanosecond of its second so that
+// entry.Mtime.Unix() > sec keeps its exact meaning as a time comparison,
+// even for dates int64 nanoseconds cannot hold.
+func deleteCutoff(ifNotModifiedAfter, ifNotModifiedAfterNs int64) time.Time {
+	if ifNotModifiedAfterNs > 0 {
+		return time.Unix(0, ifNotModifiedAfterNs)
+	}
+	if ifNotModifiedAfter <= 0 {
+		return time.Time{}
+	}
+	return time.Unix(ifNotModifiedAfter, 999_999_999)
+}
+
 func (fs *FilerServer) DeleteEntry(ctx context.Context, req *filer_pb.DeleteEntryRequest) (resp *filer_pb.DeleteEntryResponse, err error) {
 
 	glog.V(4).InfofCtx(ctx, "DeleteEntry %v", req)
@@ -1061,7 +1076,7 @@ func (fs *FilerServer) DeleteEntry(ctx context.Context, req *filer_pb.DeleteEntr
 		ctx = filer.WithKeepRemoteObject(ctx)
 	}
 	ctx, eventSink := filer.WithMetadataEventSink(ctx)
-	err = fs.filer.DeleteEntryMetaAndData(ctx, fullpath, req.IsRecursive, req.IgnoreRecursiveError, req.IsDeleteData, req.IsFromOtherCluster, req.Signatures, req.IfNotModifiedAfter)
+	err = fs.filer.DeleteEntryMetaAndData(ctx, fullpath, req.IsRecursive, req.IgnoreRecursiveError, req.IsDeleteData, req.IsFromOtherCluster, req.Signatures, deleteCutoff(req.IfNotModifiedAfter, req.IfNotModifiedAfterNs))
 	resp = &filer_pb.DeleteEntryResponse{}
 	if err != nil && err != filer_pb.ErrNotFound {
 		resp.Error = err.Error()
diff --git a/weed/server/filer_grpc_server_condition_test.go b/weed/server/filer_grpc_server_condition_test.go
index 89086a5645..33f0fc6bc3 100644
--- a/weed/server/filer_grpc_server_condition_test.go
+++ b/weed/server/filer_grpc_server_condition_test.go
@@ -382,3 +382,38 @@ func TestUpdateEntryConditionEnforced(t *testing.T) {
 		t.Fatalf("update not applied, mtime %d", got)
 	}
 }
+
+func TestDeleteCutoff(t *testing.T) {
+	base := time.Unix(1700000000, 500_000_000)
+
+	// nanoseconds take precedence when set
+	if got := deleteCutoff(1, base.UnixNano()); !got.Equal(base) {
+		t.Fatalf("ns guard should win, got %v", got)
+	}
+	// no guard stays disabled
+	if got := deleteCutoff(0, 0); !got.IsZero() {
+		t.Fatalf("no guard must stay zero, got %v", got)
+	}
+	// a whole-second guard covers its full second: entry.Mtime.Unix() > sec
+	// is entry.Mtime after the last nanosecond of that second
+	cutoff := deleteCutoff(base.Unix(), 0)
+	if want := time.Unix(0, (base.Unix()+1)*1_000_000_000-1); !cutoff.Equal(want) {
+		t.Fatalf("seconds guard = %v, want %v", cutoff, want)
+	}
+	if base.After(cutoff) {
+		t.Fatal("entry inside the guard second must not be treated as newer")
+	}
+	// a seconds guard beyond the nanosecond range keeps its date: an entry
+	// in the guarded second is deleted and only a newer one is skipped
+	farSec := time.Date(3000, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
+	farCutoff := deleteCutoff(farSec, 0)
+	if want := time.Unix(farSec, 999_999_999); !farCutoff.Equal(want) {
+		t.Fatalf("huge seconds guard = %v, want %v", farCutoff, want)
+	}
+	if time.Unix(farSec, 0).After(farCutoff) {
+		t.Fatal("entry in the guarded far-future second must not be treated as newer")
+	}
+	if !time.Unix(farSec+1, 0).After(farCutoff) {
+		t.Fatal("entry past the guarded far-future second must be treated as newer")
+	}
+}
diff --git a/weed/server/filer_grpc_server_remote_test.go b/weed/server/filer_grpc_server_remote_test.go
index 0d7659c119..7c5f165b3a 100644
--- a/weed/server/filer_grpc_server_remote_test.go
+++ b/weed/server/filer_grpc_server_remote_test.go
@@ -182,7 +182,7 @@ func TestPruneLeavesTheRemoteAlone(t *testing.T) {
 	assert.False(t, events[0].notification.IsFromOtherCluster, "filer.sync must replicate the prune")
 	assert.Contains(t, events[0].notification.OldEntry.Extended, filer.ExtKeepRemoteObjectKey, "filer.remote.sync must not delete the remote object")
 
-	require.NoError(t, fs.filer.DeleteEntryMetaAndData(context.Background(), deleted.FullPath, false, false, false, false, nil, 0))
+	require.NoError(t, fs.filer.DeleteEntryMetaAndData(context.Background(), deleted.FullPath, false, false, false, false, nil, time.Time{}))
 	assert.Equal(t, []string{"/deleted.bin"}, client.deletedPaths())
 }
 
diff --git a/weed/server/filer_grpc_server_rename.go b/weed/server/filer_grpc_server_rename.go
index 7c40b9cb64..146a700ec2 100644
--- a/weed/server/filer_grpc_server_rename.go
+++ b/weed/server/filer_grpc_server_rename.go
@@ -412,8 +412,7 @@ func (fs *FilerServer) moveSelfEntry(ctx context.Context, stream filer_pb.Seawee
 			false,
 			false,
 			signatures,
-			0,
-		); deleteErr != nil {
+			time.Time{}); deleteErr != nil {
 			return deleteErr
 		}
 	}
@@ -532,7 +531,7 @@ func (fs *FilerServer) moveSelfEntry(ctx context.Context, stream filer_pb.Seawee
 	if keepOldRemote {
 		deleteCtx = filer.WithKeepRemoteObject(deleteCtx)
 	}
-	deleteErr := fs.filer.DeleteEntryMetaAndData(deleteCtx, oldPath, false, false, false, false, signatures, 0)
+	deleteErr := fs.filer.DeleteEntryMetaAndData(deleteCtx, oldPath, false, false, false, false, signatures, time.Time{})
 	if deleteErr != nil {
 		return deleteErr
 	}
diff --git a/weed/server/filer_server_handlers_write.go b/weed/server/filer_server_handlers_write.go
index 9009a0f045..f4208168cf 100644
--- a/weed/server/filer_server_handlers_write.go
+++ b/weed/server/filer_server_handlers_write.go
@@ -270,7 +270,7 @@ func (fs *FilerServer) DeleteHandler(w http.ResponseWriter, r *http.Request) {
 		defer fs.entryLockTable.ReleaseLock(fullPath, pathLock)
 	}
 
-	err = fs.filer.DeleteEntryMetaAndData(context.Background(), fullPath, isRecursive, ignoreRecursiveError, !skipChunkDeletion, false, nil, 0)
+	err = fs.filer.DeleteEntryMetaAndData(context.Background(), fullPath, isRecursive, ignoreRecursiveError, !skipChunkDeletion, false, nil, time.Time{})
 	if err != nil && err != filer_pb.ErrNotFound {
 		glog.V(1).Infoln("deleting", objectPath, ":", err.Error())
 		writeJsonError(w, r, http.StatusInternalServerError, err)
diff --git a/weed/server/filer_server_tus_handlers.go b/weed/server/filer_server_tus_handlers.go
index a48ad142c1..a203f6ff3e 100644
--- a/weed/server/filer_server_tus_handlers.go
+++ b/weed/server/filer_server_tus_handlers.go
@@ -12,6 +12,7 @@ import (
 	"path"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/google/uuid"
 	"github.com/seaweedfs/seaweedfs/weed/glog"
@@ -482,7 +483,7 @@ func (fs *FilerServer) tusConcatFinalHandler(w http.ResponseWriter, r *http.Requ
 	// The chunks now belong to the final entry, so remove only the partials'
 	// session metadata.
 	for _, partial := range partials {
-		if err := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(fs.tusSessionPath(partial.ID)), true, false, false, false, nil, 0); err != nil {
+		if err := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(fs.tusSessionPath(partial.ID)), true, false, false, false, nil, time.Time{}); err != nil {
 			glog.V(1).Infof("Failed to cleanup TUS partial session %s: %v", partial.ID, err)
 		}
 	}
diff --git a/weed/server/filer_server_tus_session.go b/weed/server/filer_server_tus_session.go
index e9d32c2526..88be46fb31 100644
--- a/weed/server/filer_server_tus_session.go
+++ b/weed/server/filer_server_tus_session.go
@@ -129,7 +129,7 @@ func (fs *FilerServer) claimTusPartial(ctx context.Context, partial *TusSession)
 // completion. A failed rollback wedges the session as consumed: DELETE and
 // expiry then preserve its chunks, which leak until removed by fsck.
 func (fs *FilerServer) rollbackTusSessionConsumed(ctx context.Context, uploadID string) {
-	if err := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(fs.tusSessionConsumedPath(uploadID)), false, false, false, false, nil, 0); err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
+	if err := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(fs.tusSessionConsumedPath(uploadID)), false, false, false, false, nil, time.Time{}); err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
 		glog.Errorf("TUS session %s wedged as consumed, marker rollback failed: %v", uploadID, err)
 	}
 }
@@ -224,7 +224,7 @@ func (fs *FilerServer) createTusSession(ctx context.Context, uploadID, targetPat
 	// Save session info
 	if err := fs.saveTusSession(ctx, session); err != nil {
 		// Cleanup the directory on failure
-		fs.filer.DeleteEntryMetaAndData(ctx, sessionDirPath, true, true, false, false, nil, 0)
+		fs.filer.DeleteEntryMetaAndData(ctx, sessionDirPath, true, true, false, false, nil, time.Time{})
 		return nil, fmt.Errorf("save session info: %w", err)
 	}
 
@@ -422,7 +422,7 @@ func (fs *FilerServer) saveTusChunk(ctx context.Context, uploadID string, chunk
 // that is about to be deleted. Data outliving a lost record only leaks.
 func (fs *FilerServer) deleteTusChunk(ctx context.Context, session *TusSession, chunk *TusChunkInfo) {
 	chunkPath := util.FullPath(fs.tusChunkPath(session.ID, chunk.Offset, chunk.Size, chunk.FileId))
-	if err := fs.filer.DeleteEntryMetaAndData(ctx, chunkPath, false, false, false, false, nil, 0); err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
+	if err := fs.filer.DeleteEntryMetaAndData(ctx, chunkPath, false, false, false, false, nil, time.Time{}); err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
 		glog.Errorf("TUS chunk %s record kept, its data leaks: %v", chunkPath, err)
 		return
 	}
@@ -446,7 +446,7 @@ func (fs *FilerServer) deleteTusSession(ctx context.Context, uploadID string) er
 	// its consumed marker before re-verifying the .info, so once the .info is
 	// gone no new claim can pass verification, and a claim that did pass was
 	// created earlier and is visible at the check below.
-	if err := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(fs.tusSessionInfoPath(uploadID)), false, false, false, false, nil, 0); err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
+	if err := fs.filer.DeleteEntryMetaAndData(ctx, util.FullPath(fs.tusSessionInfoPath(uploadID)), false, false, false, false, nil, time.Time{}); err != nil && !errors.Is(err, filer_pb.ErrNotFound) {
 		return fmt.Errorf("delete session info: %w", err)
 	}
 
@@ -470,7 +470,7 @@ func (fs *FilerServer) deleteTusSession(ctx context.Context, uploadID string) er
 
 	// Delete the session directory
 	sessionDirPath := util.FullPath(fs.tusSessionPath(uploadID))
-	if err := fs.filer.DeleteEntryMetaAndData(ctx, sessionDirPath, true, true, false, false, nil, 0); err != nil {
+	if err := fs.filer.DeleteEntryMetaAndData(ctx, sessionDirPath, true, true, false, false, nil, time.Time{}); err != nil {
 		return fmt.Errorf("delete session directory: %w", err)
 	}
 
@@ -614,7 +614,7 @@ func (fs *FilerServer) completeTusUpload(ctx context.Context, session *TusSessio
 
 	// Delete the session (but keep the chunks since they're now part of the final file)
 	sessionDirPath := util.FullPath(fs.tusSessionPath(session.ID))
-	if err := fs.filer.DeleteEntryMetaAndData(ctx, sessionDirPath, true, false, false, false, nil, 0); err != nil {
+	if err := fs.filer.DeleteEntryMetaAndData(ctx, sessionDirPath, true, false, false, false, nil, time.Time{}); err != nil {
 		glog.V(1).Infof("Failed to cleanup TUS session directory %s: %v", session.ID, err)
 	}
 
diff --git a/weed/shell/command_fs_verify.go b/weed/shell/command_fs_verify.go
index 24007793f0..3f32db9716 100644
--- a/weed/shell/command_fs_verify.go
+++ b/weed/shell/command_fs_verify.go
@@ -163,8 +163,7 @@ type ItemEntry struct {
 	chunks    []*filer_pb.FileChunk
 	rawChunks []*filer_pb.FileChunk
 	path      util.FullPath
-	mtimeSec  int64
-	md5       []byte
+	attr      *filer_pb.FuseAttributes
 }
 
 // resolveAndVerify expands chunk manifests and verifies the entry's needles.
@@ -220,8 +219,7 @@ func (c *commandFsVerify) verifyProcessMetadata(path string, wg *sync.WaitGroup)
 					if *c.pruneEntries && hasMissingNeedles {
 						pruned, pruneErr := c.pruneEntry(
 							util.NewFullPath(message.NewParentPath, message.NewEntry.Name),
-							message.NewEntry.Attributes.Mtime,
-							message.NewEntry.Attributes.Md5,
+							message.NewEntry.Attributes,
 							message.NewEntry.Chunks)
 						if pruneErr != nil {
 							fmt.Fprintf(c.writer, "prune %s failed: %v\n", entryPath, pruneErr)
@@ -371,13 +369,28 @@ func (c *commandFsVerify) verifyEntry(path string, chunks []*filer_pb.FileChunk,
 	return itemIsVerifed.Load(), hasMissingNeedlesFlag.Load()
 }
 
+// deleteEntryCutoff splits an entry mtime into the conditional-delete fields:
+// seconds keep older filers enforcing the guard, nanoseconds keep same-second
+// precision where int64 can hold them. ok is false when neither field can
+// express the cutoff and the delete must be skipped rather than sent unguarded.
+func deleteEntryCutoff(mtimeSec int64, mtimeNsec int32) (sec, ns int64, ok bool) {
+	sec = mtimeSec
+	if sec <= 0 {
+		return 0, 0, false
+	}
+	if nsec := int64(mtimeNsec); nsec >= 0 && nsec < 1e9 && sec <= (math.MaxInt64-nsec)/1e9 {
+		ns = sec*1e9 + nsec
+	}
+	return sec, ns, true
+}
+
 // pruneEntry deletes an entry whose needles are gone, unless the entry
 // changed since verification. Three guards protect a concurrent repair:
 // re-lookup with mtime/md5 comparison, an identity check of the chunk set
 // (an append or rewrite in the same second as the original mtime changes the
 // chunks but not the timestamps), and IfNotModifiedAfter on the delete. The
 // entry is only counted as pruned when a follow-up lookup confirms it is gone.
-func (c *commandFsVerify) pruneEntry(path util.FullPath, mtimeSec int64, md5 []byte, expectedChunks []*filer_pb.FileChunk) (pruned bool, err error) {
+func (c *commandFsVerify) pruneEntry(path util.FullPath, attr *filer_pb.FuseAttributes, expectedChunks []*filer_pb.FileChunk) (pruned bool, err error) {
 	dir, name := path.DirAndName()
 	expectedIds := chunkFingerprints(expectedChunks)
 	lookupErr := c.env.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
@@ -392,11 +405,11 @@ func (c *commandFsVerify) pruneEntry(path util.FullPath, mtimeSec int64, md5 []b
 			return err
 		}
 		att := lookupResp.Entry.GetAttributes()
-		if att.GetMtime() != mtimeSec {
+		if att.GetMtime() != attr.GetMtime() || att.GetMtimeNs() != attr.GetMtimeNs() {
 			fmt.Fprintf(c.writer, "skip pruning %s: entry changed since verification\n", path)
 			return nil
 		}
-		if len(md5) > 0 && !bytes.Equal(att.GetMd5(), md5) {
+		if md5 := attr.GetMd5(); len(md5) > 0 && !bytes.Equal(att.GetMd5(), md5) {
 			fmt.Fprintf(c.writer, "skip pruning %s: entry changed since verification\n", path)
 			return nil
 		}
@@ -404,10 +417,16 @@ func (c *commandFsVerify) pruneEntry(path util.FullPath, mtimeSec int64, md5 []b
 			fmt.Fprintf(c.writer, "skip pruning %s: entry changed since verification\n", path)
 			return nil
 		}
+		sec, ns, ok := deleteEntryCutoff(attr.GetMtime(), attr.GetMtimeNs())
+		if !ok {
+			fmt.Fprintf(c.writer, "skip pruning %s: mtime cannot set a delete condition\n", path)
+			return nil
+		}
 		deleteResp, err := client.DeleteEntry(context.Background(), &filer_pb.DeleteEntryRequest{
-			Directory:          dir,
-			Name:               name,
-			IfNotModifiedAfter: mtimeSec,
+			Directory:            dir,
+			Name:                 name,
+			IfNotModifiedAfter:   sec,
+			IfNotModifiedAfterNs: ns,
 		})
 		if err != nil {
 			return err
@@ -487,8 +506,7 @@ func (c *commandFsVerify) verifyTraverseBfs(path string) (fileCount uint64, errC
 					chunks:    dataChunks,
 					rawChunks: entry.Entry.GetChunks(),
 					path:      util.NewFullPath(entry.Dir, entry.Entry.Name),
-					mtimeSec:  entry.Entry.GetAttributes().GetMtime(),
-					md5:       entry.Entry.GetAttributes().GetMd5(),
+					attr:      entry.Entry.GetAttributes(),
 				}:
 				case <-ctx.Done():
 					return ctx.Err()
@@ -508,7 +526,7 @@ func (c *commandFsVerify) verifyTraverseBfs(path string) (fileCount uint64, errC
 					}
 					fileCount++
 				} else if *c.pruneEntries && hasMissingNeedles {
-					pruned, pruneErr := c.pruneEntry(i.path, i.mtimeSec, i.md5, i.rawChunks)
+					pruned, pruneErr := c.pruneEntry(i.path, i.attr, i.rawChunks)
 					if pruneErr != nil {
 						fmt.Fprintf(c.writer, "prune %s failed: %v\n", itemPath, pruneErr)
 					} else if pruned {
diff --git a/weed/shell/command_fs_verify_test.go b/weed/shell/command_fs_verify_test.go
index 5c997ff229..bc895f3846 100644
--- a/weed/shell/command_fs_verify_test.go
+++ b/weed/shell/command_fs_verify_test.go
@@ -4,11 +4,13 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"math"
 	"net"
 	"os"
 	"path/filepath"
 	"sync"
 	"testing"
+	"time"
 
 	"github.com/seaweedfs/seaweedfs/weed/pb"
 	"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
@@ -48,10 +50,18 @@ func (s *fsVerifyTestFilerServer) LookupDirectoryEntry(_ context.Context, req *f
 
 func (s *fsVerifyTestFilerServer) DeleteEntry(_ context.Context, req *filer_pb.DeleteEntryRequest) (*filer_pb.DeleteEntryResponse, error) {
 	s.deleted = append(s.deleted, req)
-	// mirror the real filer: an entry newer than IfNotModifiedAfter is
+	// mirror the real filer: an entry newer than the cutoff is
 	// silently skipped, no error and no Error field
-	if s.entry != nil && req.IfNotModifiedAfter > 0 && s.entry.Attributes.GetMtime() > req.IfNotModifiedAfter {
-		return &filer_pb.DeleteEntryResponse{}, nil
+	if s.entry != nil {
+		entryNewer := false
+		if req.IfNotModifiedAfterNs > 0 {
+			entryNewer = s.entry.Attributes.GetMtime()*1e9+int64(s.entry.Attributes.GetMtimeNs()) > req.IfNotModifiedAfterNs
+		} else if req.IfNotModifiedAfter > 0 {
+			entryNewer = s.entry.Attributes.GetMtime() > req.IfNotModifiedAfter
+		}
+		if entryNewer {
+			return &filer_pb.DeleteEntryResponse{}, nil
+		}
 	}
 	s.entry = nil
 	return &filer_pb.DeleteEntryResponse{}, nil
@@ -234,13 +244,16 @@ func TestFsVerifyVerifyEntryPrunability(t *testing.T) {
 // Pruning must only delete the entry when it did not change since the
 // verification pass — a re-upload fixes the file and must survive.
 func TestFsVerifyPruneEntryGuards(t *testing.T) {
+	mtimeNs := time.Now().Add(-time.Hour).UnixNano()
+	attr := &filer_pb.FuseAttributes{
+		Mtime:   mtimeNs / 1e9,
+		MtimeNs: int32(mtimeNs % 1e9),
+		Md5:     []byte("md5"),
+	}
 	filer := &fsVerifyTestFilerServer{entry: &filer_pb.Entry{
-		Name: "file",
-		Attributes: &filer_pb.FuseAttributes{
-			Mtime: 100,
-			Md5:   []byte("md5"),
-		},
-		Chunks: []*filer_pb.FileChunk{{Fid: &filer_pb.FileId{VolumeId: 7, FileKey: 42}}},
+		Name:       "file",
+		Attributes: attr,
+		Chunks:     []*filer_pb.FileChunk{{Fid: &filer_pb.FileId{VolumeId: 7, FileKey: 42}}},
 	}}
 	commandEnv, _, cleanup := newFsVerifyTestCommandEnv(t, filer, &fsVerifyTestVolumeServer{})
 	defer cleanup()
@@ -248,27 +261,43 @@ func TestFsVerifyPruneEntryGuards(t *testing.T) {
 
 	chunks := []*filer_pb.FileChunk{{Fid: &filer_pb.FileId{VolumeId: 7, FileKey: 42}}}
 
-	// unchanged entry: deleted
-	pruned, err := c.pruneEntry(util.NewFullPath("/buckets/b", "file"), 100, []byte("md5"), chunks)
+	// unchanged entry: deleted; the request carries the cutoff in seconds
+	// for older filers and nanoseconds for same-second precision
+	pruned, err := c.pruneEntry(util.NewFullPath("/buckets/b", "file"), attr, chunks)
 	if err != nil || !pruned {
 		t.Fatalf("expected prune of unchanged entry, got pruned=%v err=%v", pruned, err)
 	}
+	if len(filer.deleted) != 1 || filer.deleted[0].IfNotModifiedAfter != mtimeNs/1e9 || filer.deleted[0].IfNotModifiedAfterNs != mtimeNs {
+		t.Fatalf("delete sent wrong cutoffs: %+v", filer.deleted)
+	}
 
 	// re-uploaded entry (new mtime/md5): must survive
-	filer.entry = &filer_pb.Entry{Name: "file", Attributes: &filer_pb.FuseAttributes{Mtime: 200, Md5: []byte("new")}}
-	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), 100, []byte("md5"), chunks)
+	filer.entry = &filer_pb.Entry{Name: "file", Attributes: &filer_pb.FuseAttributes{Mtime: mtimeNs/1e9 + 1, Md5: []byte("new")}}
+	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), attr, chunks)
 	if err != nil || pruned {
 		t.Fatalf("changed entry must not be pruned, got pruned=%v err=%v", pruned, err)
 	}
 
+	// same-second rewrite that only advanced the nanosecond component:
+	// must survive
+	filer.entry = &filer_pb.Entry{
+		Name:       "file",
+		Attributes: &filer_pb.FuseAttributes{Mtime: mtimeNs / 1e9, MtimeNs: int32(mtimeNs%1e9) + 1, Md5: []byte("md5")},
+		Chunks:     []*filer_pb.FileChunk{{Fid: &filer_pb.FileId{VolumeId: 7, FileKey: 42}}},
+	}
+	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), attr, chunks)
+	if err != nil || pruned {
+		t.Fatalf("sub-second rewrite must not be pruned, got pruned=%v err=%v", pruned, err)
+	}
+
 	// same-second rewrite: timestamps identical but the chunk set differs —
 	// the new upload must survive
 	filer.entry = &filer_pb.Entry{
 		Name:       "file",
-		Attributes: &filer_pb.FuseAttributes{Mtime: 100, Md5: []byte("md5")},
+		Attributes: &filer_pb.FuseAttributes{Mtime: mtimeNs / 1e9, MtimeNs: int32(mtimeNs % 1e9), Md5: []byte("md5")},
 		Chunks:     []*filer_pb.FileChunk{{Fid: &filer_pb.FileId{VolumeId: 7, FileKey: 999}}},
 	}
-	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), 100, []byte("md5"), chunks)
+	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), attr, chunks)
 	if err != nil || pruned {
 		t.Fatalf("same-second rewrite must not be pruned, got pruned=%v err=%v", pruned, err)
 	}
@@ -276,22 +305,48 @@ func TestFsVerifyPruneEntryGuards(t *testing.T) {
 	// identical chunk set (order-insensitive): prunes
 	filer.entry = &filer_pb.Entry{
 		Name:       "file",
-		Attributes: &filer_pb.FuseAttributes{Mtime: 100, Md5: []byte("md5")},
+		Attributes: &filer_pb.FuseAttributes{Mtime: mtimeNs / 1e9, MtimeNs: int32(mtimeNs % 1e9), Md5: []byte("md5")},
 		Chunks:     []*filer_pb.FileChunk{{Fid: &filer_pb.FileId{VolumeId: 7, FileKey: 42}}},
 	}
-	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), 100, []byte("md5"), chunks)
+	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), attr, chunks)
 	if err != nil || !pruned {
 		t.Fatalf("expected prune when chunk set matches, got pruned=%v err=%v", pruned, err)
 	}
 
 	// entry already gone: no error, no delete
 	filer.entry = nil
-	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), 100, nil, chunks)
+	pruned, err = c.pruneEntry(util.NewFullPath("/buckets/b", "file"), &filer_pb.FuseAttributes{Mtime: mtimeNs / 1e9, MtimeNs: int32(mtimeNs % 1e9)}, chunks)
 	if err != nil || pruned {
 		t.Fatalf("missing entry must be a no-op, got pruned=%v err=%v", pruned, err)
 	}
 }
 
+func TestDeleteEntryCutoff(t *testing.T) {
+	// a regular mtime fills both fields
+	sec, ns, ok := deleteEntryCutoff(1_761_504_000, 500_000_000)
+	if !ok || sec != 1_761_504_000 || ns != 1_761_504_000_500_000_000 {
+		t.Fatalf("regular mtime: got %d %d %v", sec, ns, ok)
+	}
+	// an mtime in the first seconds after the epoch is unambiguous in both
+	// fields once units are explicit
+	sec, ns, ok = deleteEntryCutoff(100, 0)
+	if !ok || sec != 100 || ns != 100_000_000_000 {
+		t.Fatalf("epoch mtime: got %d %d %v", sec, ns, ok)
+	}
+	// a pre-epoch mtime cannot arm either field — the delete must be skipped
+	if _, _, ok = deleteEntryCutoff(-100, 0); ok {
+		t.Fatal("pre-epoch mtime must report ok=false")
+	}
+	if _, _, ok = deleteEntryCutoff(0, 0); ok {
+		t.Fatal("zero mtime must report ok=false")
+	}
+	// an mtime past the UnixNano range degrades to the seconds field
+	sec, ns, ok = deleteEntryCutoff(math.MaxInt64/1_000_000_000+1, 0)
+	if !ok || ns != 0 || sec != math.MaxInt64/1_000_000_000+1 {
+		t.Fatalf("overflow mtime: got %d %d %v", sec, ns, ok)
+	}
+}
+
 // An unresolvable chunk manifest is an entry-level verification failure even
 // when the raw manifest needle is healthy; raw chunks are still checked so a
 // missing manifest needle can be pruned.
diff --git a/weed/shell/command_volume_fsck.go b/weed/shell/command_volume_fsck.go
index ef6b61bfab..ff3c3fe0e8 100644
--- a/weed/shell/command_volume_fsck.go
+++ b/weed/shell/command_volume_fsck.go
@@ -863,7 +863,7 @@ func (c *commandVolumeFsck) purgeEmptyDirectories() {
 		if mtime <= 0 || mtime >= time.Now().Add(-directoryQuietPeriod).Unix() {
 			continue
 		}
-		if err := c.deleteEmptyDirectory(dir, mtime); err != nil {
+		if err := c.deleteEmptyDirectory(dir, entry.Attributes); err != nil {
 			if !errors.Is(err, filer.ErrNonEmptyFolder) {
 				fmt.Fprintf(c.writer, "delete empty directory %s: %v\n", dir, err)
 			}
@@ -873,16 +873,21 @@ func (c *commandVolumeFsck) purgeEmptyDirectories() {
 	}
 }
 
-// deleteEmptyDirectory deletes dir unless it changed since it was looked up at mtime,
-// so a directory promoted to an S3 object meanwhile survives. The delete is not
-// recursive, leaving the filer to reject a directory that is not empty.
-func (c *commandVolumeFsck) deleteEmptyDirectory(dir util.FullPath, mtime int64) error {
+// deleteEmptyDirectory deletes dir unless it changed since it was looked up,
+// so a directory promoted to an S3 object meanwhile survives. The delete is
+// not recursive, leaving the filer to reject a directory that is not empty.
+func (c *commandVolumeFsck) deleteEmptyDirectory(dir util.FullPath, attr *filer_pb.FuseAttributes) error {
 	parent, name := dir.DirAndName()
+	sec, ns, ok := deleteEntryCutoff(attr.GetMtime(), attr.GetMtimeNs())
+	if !ok {
+		return nil
+	}
 	return c.env.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		resp, err := client.DeleteEntry(context.Background(), &filer_pb.DeleteEntryRequest{
-			Directory:          parent,
-			Name:               name,
-			IfNotModifiedAfter: mtime,
+			Directory:            parent,
+			Name:                 name,
+			IfNotModifiedAfter:   sec,
+			IfNotModifiedAfterNs: ns,
 		})
 		if err != nil {
 			return err
diff --git a/weed/shell/command_volume_fsck_test.go b/weed/shell/command_volume_fsck_test.go
index 7804b85224..43bb07efea 100644
--- a/weed/shell/command_volume_fsck_test.go
+++ b/weed/shell/command_volume_fsck_test.go
@@ -107,7 +107,13 @@ func (s *stubFilerServer) DeleteEntry(ctx context.Context, req *filer_pb.DeleteE
 	if !found {
 		return &filer_pb.DeleteEntryResponse{Error: filer_pb.ErrNotFound.Error()}, nil
 	}
-	if req.IfNotModifiedAfter > 0 && entry.Attributes.GetMtime() > req.IfNotModifiedAfter {
+	entryNewer := false
+	if req.IfNotModifiedAfterNs > 0 {
+		entryNewer = entry.Attributes.GetMtime()*1e9+int64(entry.Attributes.GetMtimeNs()) > req.IfNotModifiedAfterNs
+	} else if req.IfNotModifiedAfter > 0 {
+		entryNewer = entry.Attributes.GetMtime() > req.IfNotModifiedAfter
+	}
+	if entryNewer {
 		return &filer_pb.DeleteEntryResponse{}, nil
 	}
 	for path := range s.entries {
@@ -209,8 +215,8 @@ func TestVolumeFsckPurgeEmptyDirectoriesKeepsFreshDirectory(t *testing.T) {
 func TestVolumeFsckPurgeEmptyDirectoriesKeepsChangedDirectory(t *testing.T) {
 	stub := &stubFilerServer{
 		entries: map[string]*filer_pb.Entry{
-			"/race":     {IsDirectory: true, Attributes: &filer_pb.FuseAttributes{Mtime: 100}},
-			"/race/dir": {IsDirectory: true, Attributes: &filer_pb.FuseAttributes{Mtime: 100}},
+			"/race":     {IsDirectory: true, Attributes: &filer_pb.FuseAttributes{Mtime: time.Now().Add(-time.Hour).Unix()}},
+			"/race/dir": {IsDirectory: true, Attributes: &filer_pb.FuseAttributes{Mtime: time.Now().Add(-time.Hour).Unix()}},
 		},
 		writtenAfterLookup: map[string]bool{"/race/dir": true},
 	}