unpreventable damage vs flesh of marble

I have a question: the Flesh of Marble card says that the vampire takes the first damage and the rest is prevented, but what about cases of unpreventable damage? Since the card describes the "prevent" effect, does that mean the unpreventable effect applies normally?


Alanmut

so if on a given round a vampire with flesh of marble was assigned 2 unpreventable damage and 4 other damage, he take 3 damage (2 unpreventable and another to activate the FoM) or one of unpreveantable damage can activate the FoM and in this case he took only 2 (unpreventable) damage?