Does VVR support cascaded space-optimized snapshot?

Configuration: Infoscale Storage 8.0 on Linux

Infoscale storage foundation supports cascaded snapshot using vxsnap infrontof= to do cascaded snapshots

Infoscale storage (with Volume replicator) documentation doesn't describe cascaded snapshot.
I checked manpage for vxrvg. Does not have an infront of attribute.
Does that mean cascaded space-optimized snapshots are not supported/permitted on RVG?