What to do when a nasus is playing so extremely safe?

I play squishy laners who are ranged so pre-6 I'm alright against nasus. However the nasus' I god damn hate are the ones which just sit an entire lane away from you but still because of these recent buff end up with 300 stacks at 20 mins. Their little aoe ability which reduces armour ends up doing more damage to me + their minions until they reach 6 and obliterate me with their R. How the hell do you play against a nasus like this? You can't kill them, you can't stop them getting stacks. What do I do?
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