code: func (pm *VolumePluginMgr) FindDeviceMountablePluginByName(name string) (DeviceMountableVolumePlugin, error) {
  	volumePlugin, err := pm.FindPluginByName(name)
  	if err != nil {
  		return nil, err
  	}
  	if deviceMountableVolumePlugin, ok := volumePlugin.(DeviceMountableVolumePlugin); ok {
  		return deviceMountableVolumePlugin, nil
  	}
  	return nil, nil
  }
docs: // FindDeviceMountablePluginByName fetches a devicemountable volume plugin by name.