Domain Mapping Plugin: sub-domains?

HI guys, I could test this I know but wanted to ask;

If a client creates a sub-domain of their own domain (for example:

can they then point this to my multi-site and be domain mapped over one of my sub domains?

I can see obviously a client can point a domain to my domain mapping multisite, but Ive not seen it explicitly stated for a client’s own sub-domain.