code: func NormalizePath(path string) (string, error) {
  	s, err := filepath.Abs(path)
  	if err != nil {
  		return "", trace.ConvertSystemError(err)
  	}
  	abs, err := filepath.EvalSymlinks(s)
  	if err != nil {
  		return "", trace.ConvertSystemError(err)
  	}
  	return abs, nil
  }
docs: // NormalizePath normalises path, evaluating symlinks and converting local
  // paths to absolute