After observation, I checked carefully the GS mini function during flight during windy conditions and the first time it was exactly how FlightDetent sais: The first 10kt of extra wind was disregarded. It was a 321 CEO with Sharklets.
But then on another flight and plane, all the excess wind was considered to compute the VAPP.
Can’t remember exactly which plane it was tho.
I will try to observe and take accurate notes next time.