The Magic Find and Gold Find percentages for both follower contributions and Fortune Shrine bonuses are intended to respect the 300% MF/GF cap. Nephalem Valor bonuses will continue to stack beyond this cap, however.
That said, we’ve seen some posts that MF/GF contributions from followers may currently be stacking above the cap, and we’re looking into those reports.
Pour info, à l'heure actuelle, il est possible de dépasser le cap sur le MF grace au follower