code: func supportsCOption(mj, mn, mc int) bool {
  	return mj > 1 || (mj == 1 && (mn > 4 || (mn == 4 && mc >= 11)))
  }
docs: // iptables -C, --check option was added in v.1.4.11
  // http://ftp.netfilter.org/pub/iptables/changes-iptables-1.4.11.txt