code: func arrangeUserFilterRule() {
  	_, err := iptables.NewChain(userChain, iptables.Filter, false)
  	if err != nil {
  		logrus.Warnf("Failed to create %s chain: %v", userChain, err)
  		return
  	}
  
  	if err = iptables.AddReturnRule(userChain); err != nil {
  		logrus.Warnf("Failed to add the RETURN rule for %s: %v", userChain, err)
  		return
  	}
  
  	err = iptables.EnsureJumpRule("FORWARD", userChain)
  	if err != nil {
  		logrus.Warnf("Failed to ensure the jump rule for %s: %v", userChain, err)
  	}
  }
docs: // This chain allow users to configure firewall policies in a way that persists
  // docker operations/restarts. Docker will not delete or modify any pre-existing
  // rules from the DOCKER-USER filter chain.