fuse integration: add POSIX compliance test suite

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

test/fuse_integration/fallocate_unsupported.go

@@ -0,0 +1,30 @@
+//go:build !linux && !darwin
+
+package fuse
+
+import (
+	"errors"
+)
+
+// File allocation support for unsupported platforms
+
+var ErrFallocateNotSupported = errors.New("fallocate not supported on this platform")
+
+const (
+	// Dummy flags for compatibility
+	FALLOC_FL_KEEP_SIZE      = 0x01
+	FALLOC_FL_PUNCH_HOLE     = 0x02
+	FALLOC_FL_NO_HIDE_STALE  = 0x04
+	FALLOC_FL_COLLAPSE_RANGE = 0x08
+	FALLOC_FL_ZERO_RANGE     = 0x10
+	FALLOC_FL_INSERT_RANGE   = 0x20
+	FALLOC_FL_UNSHARE_RANGE  = 0x40
+)
+
+func fallocateFile(fd int, mode int, offset int64, length int64) error {
+	return ErrFallocateNotSupported
+}
+
+func isFallocateSupported() bool {
+	return false
+}