So far if it supports 3.0 USB, it does 3.1.
"The USB 3.1 standard is backward compatible with USB 3.0 and USB 2.0"

However you don't see a lot of 3.1 devices so it's a non-starter to me.

OK, why would you open up this laptop? Expresscards plug into those expresscard slots. This laptop does not have such a slot when I checked on the web.

As no slots are there there's a slight chance the Gigabit Ethernet might copy files faster to a GB NAS. Slight but you would have to test and be sure to use FTP for the testing.