code: func (m *Mercury) GetContainers(ctx context.Context, IDs []string) (containers []*types.Container, err error) {
  	for _, ID := range IDs {
  		container, err := m.GetContainer(ctx, ID)
  		if err != nil {
  			return containers, err
  		}
  		containers = append(containers, container)
  	}
  	return containers, err
  }
docs: // GetContainers get many containers
  // TODO merge etcd ops