fuse: tweak comment

internal/fuse/file.go

@@ -55,7 +55,9 @@ func (f *file) Attr(_ context.Context, a *fuse.Attr) error {
 	a.Size = f.node.Size
 	a.Blocks = (f.node.Size + blockSize - 1) / blockSize
 	a.BlockSize = blockSize
-	// present a link count > 0 to keep over-eager stat() .st_nlink checks (e.g., from Samba's smbd) happy
+	// Windows (and other non-POSIX) backups may store a link count of 0.
+	// FUSE must still report a positive nlink so tools that validate stat()
+	// (e.g. Samba) accept the file.
 	a.Nlink = max(uint32(1), uint32(f.node.Links))
 
 	if !f.root.cfg.OwnerIsRoot {