code: func getAttachmentName(volName, csiDriverName, nodeName string) string {
  	result := sha256.Sum256([]byte(fmt.Sprintf("%s%s%s", volName, csiDriverName, nodeName)))
  	return fmt.Sprintf("csi-%x", result)
  }
docs: // getAttachmentName returns csi-<sha256(volName,csiDriverName,NodeName)>