Lxs snapshot --stateful issue

tried to make “snapshot --stateful” of CT with hardware NIC and got this:
lxc 20180817224415.454 ERROR lxc_criu - criu.c:criu_ok:889 - Found un-dumpable network: phys (eth0)
does it mean that --stateful snapshot impossible for CT with hardware NIC?

Looks like it, it’s not something we’ve seen before but the CRIU error seems pretty clear that it’s not supported.