Please add an option which checks whether stratum of server exceeds a certain value.
Logged In: YES
That would be fairly easy now that i know that much about check_ntp and can be interesting in many scenarios :)
Committed in subversion
Some additional info: Due to some technical reasons the original fix for check_ntp have been reverted.
Meanwhile I split check_ntp into two plugins and one of them (check_ntp_peer) will have the better method of getting the stratum. Should be in the next release anyway and check_ntp will be marked as deprecated (but will remain for some time).