If the EU regulation would explicitly say something is allowed, then local law cannot prohibit it (and the other way around).
But as far as I know this is not the case with respect to zero-rating or "fast lanes".
Without a doubt, the most interesting bit of the Dutch implementation is the explicit banning of zero rating, the practice where telecom operators do not charge end customers for data used by specific applications or internet services. In addition to that, the Minister of Economic Affairs must establish binding rules regarding traffic management in the case of impending network congestion and specialised services. He may also establish other rules explaining how the net neutrality regulation should be interpreted.
ps, I'm a bit off on the usage of "regulation". An "EU directive" needs to be translated into local law (and thus though through the law construction procedure) and an "EU regulation" only needs to have some i's dotted and t's croess and activated (so still being activated as local law, but doesn't have to go through the classical law construction procedure).