code: func (vol Volume) ListRequest() (ListCommand, error) {
  	req := &ListVolumes{
  		Name:             vol.Name,
  		Type:             vol.Type,
  		VirtualMachineID: vol.VirtualMachineID,
  		ZoneID:           vol.ZoneID,
  	}
  
  	return req, nil
  }
docs: // ListRequest builds the ListVolumes request