code: func (l *LockerOptions) Prefix() string {
  	prefix := l.prefix
  	if !strings.HasPrefix(prefix, "/") {
  		prefix = "/" + prefix
  	}
  
  	if prefix == "" {
  		return DefaultPrefix
  	} else {
  		return prefix
  	}
  }
docs: // Returns the string prefix used to store keys in etcd3