code: func (b *BigIP) Volumes() (*Volumes, error) {
  	var volumes Volumes
  	err, _ := b.getForEntity(&volumes, uriSys, uriSoftware, uriVolume)
  	if err != nil {
  		return nil, err
  	}
  
  	return &volumes, nil
  }
docs: // Volumes returns a list of Software Volumes.