code: func (runner *runner) FlushChain(table Table, chain Chain) error {
  	fullArgs := makeFullArgs(table, chain)
  
  	runner.mu.Lock()
  	defer runner.mu.Unlock()
  
  	out, err := runner.run(opFlushChain, fullArgs)
  	if err != nil {
  		return fmt.Errorf("error flushing chain %q: %v: %s", chain, err, out)
  	}
  	return nil
  }
docs: // FlushChain is part of Interface.