I have seen reports on a different thread that non *G guests even on the same PNR with *G are not allowed fast track access (Gold Track, is that the same thing?) at some airports in Europe.
Can confirm this for BCN, MXP, LIN and CDG (and probably others I can't remember at the moment). No fast track for guest, only priority boarding and lounge. It's not an official benefit and shouldn't be expected, especially at outstations.