code: func (o *UlimitOpt) Set(val string) error {
  	l, err := units.ParseUlimit(val)
  	if err != nil {
  		return err
  	}
  
  	(*o.values)[l.Name] = l
  
  	return nil
  }
docs: // Set validates a Ulimit and sets its name as a key in UlimitOpt