MTU sweep for ipv6 ping6?

The answer to https://apple.stackexchange.com/questions/125068/is-there-an-equivalent-utility-to-linuxs-tracepath-for-os-x suggests to use

ping -g 1444 -G 1508 -c 2 -h 1 -D example.com

How do I modify this for ipv6? Tried

ping6 -g 1444 -G 1508 -c 2 -h 1 -D 2606:4700:4700::1111

but this gives a ping6: getaddrinfo for the gateway 1444: nodename nor servname provided, or not known error. EDIT: If you wish to determine the MTU of a path then don't forget -m as described here https://njetwork.wordpress.com/2014/01/17/ping6-and-fragments/ and use `netstat -narWl -f inet6 `