code: func (s Traces) FuncName() string {
  	if len(s) == 0 {
  		return ""
  	}
  	fn := filepath.ToSlash(s[0].Func)
  	idx := strings.LastIndex(fn, "/")
  	if idx == -1 || idx == len(fn)-1 {
  		return fn
  	}
  	return fn[idx+1:]
  }
docs: // Func returns just function name