return false, firstErr
}

// walk recursively descends path, calling walkFn. Copied, with some
// modifications from path/filepath.walk.
func walk(path string, info fs.FileInfo, walkFn filepath.WalkFunc) error {
	if err := walkFn(path, info, nil); err != nil || !info.IsDir() {
		return err
	}

	fis, err := ReadDir(path)
	if err != nil {
		return walkFn(path, info, err)
	}