code: func (attacher *rbdAttacher) VolumesAreAttached(specs []*volume.Spec, nodeName types.NodeName) (map[*volume.Spec]bool, error) {
  	volumesAttachedCheck := make(map[*volume.Spec]bool)
  	for _, spec := range specs {
  		volumesAttachedCheck[spec] = true
  	}
  	return volumesAttachedCheck, nil
  }
docs: // VolumesAreAttached implements Attacher.VolumesAreAttached.
  // There is no way to confirm whether the volume is attached or not from
  // outside of the kubelet node. This method needs to return true always, like
  // iSCSI, FC plugin.