fix(internal/vfs): implement gname and uname for modtimefileinfo

Signed-off-by: Xe Iaso <[e-mail]>

internal/vfs/modtimefs.go

···
 	return fi.Time
 }
 
+func (fi modTimeFileInfo) Uname() (string, error) {
+	return "root", nil
+}
+
+func (fi modTimeFileInfo) Gname() (string, error) {
+	return "root", nil
+}
+
 // modTimeDirEntry wraps fs.DirEntry to override Info().ModTime().
 type modTimeDirEntry struct {
 	fs.DirEntry