You will still be able to run CG snapshots on vfilers.
The thing that is not supported is around wafl_sync along with CG snapshot, as enabled by this parameter below.
There are cases, where SC can issue a wafl_sync before a cg snapshot.
Since wafl_sync is not enabled at a vfiler level, and only available in pfiler level, having the above setting will cause SC to fail.
Please let me know if you have further questions.