fuse: add missing type assertion for optional interfaces

internal/fuse/dir.go

@@ -20,6 +20,8 @@ import (
 
 // Statically ensure that *dir implement those interface
 var _ = fs.HandleReadDirAller(&dir{})
+var _ = fs.NodeGetxattrer(&dir{})
+var _ = fs.NodeListxattrer(&dir{})
 var _ = fs.NodeStringLookuper(&dir{})
 
 type dir struct {

internal/fuse/link.go

@@ -12,6 +12,8 @@ import (
 )
 
 // Statically ensure that *link implements the given interface
+var _ = fs.NodeGetxattrer(&link{})
+var _ = fs.NodeListxattrer(&link{})
 var _ = fs.NodeReadlinker(&link{})
 
 type link struct {

internal/fuse/other.go

@@ -7,9 +7,13 @@ import (
 	"context"
 
 	"github.com/anacrolix/fuse"
+	"github.com/anacrolix/fuse/fs"
 	"github.com/restic/restic/internal/restic"
 )
 
+// Statically ensure that *other implements the given interface
+var _ = fs.NodeReadlinker(&other{})
+
 type other struct {
 	root  *Root
 	node  *restic.Node