docs: def flush(table='filter', chain='', family='ipv4'):
      '''
      Flush the chain in the specified table, flush all chains in the specified
      table if not specified chain.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' iptables.flush filter INPUT
  
          IPv6:
          salt '*' iptables.flush filter INPUT family=ipv6
      '''
  
      wait = '--wait' if _has_option('--wait', family) else ''
      cmd = '{0} {1} -t {2} -F {3}'.format(_iptables_cmd(family), wait, table, chain)
      out = __salt__['cmd.run'](cmd)
      return out