S2D quorum question

Hi All

I´d truly appreciate your help to clarify the quorum operative in an S2D environment. I´ve read a bunch about Cluster and pool quorum, I know how these two quorum works, but I dont clearly see which one applies for Storage spaces Direct.

Quorum scheme should apply , so every disk should have a vote, and the owner should have another.

But I see a failover cluster supporing this S2d cluster, and this leevrages a File Witness (for example)  

Which one takes effect?

Best Regards