code: func (f *Func) PkgName() string {
  	parts := strings.SplitN(filepath.Base(f.Raw), ".", 2)
  	if len(parts) == 1 {
  		return ""
  	}
  	s, _ := url.QueryUnescape(parts[0])
  	return s
  }
docs: // PkgName is the package name for this function reference.