Disable atime on root dataset?

I've just setup a new machine with FreeNAS 11.1 32bit (hehe, just kidding) and I see by default the root dataset has atime enabled.





My question is: what might break if I disable atime there? I'm going to create child datasets for different shares/users anyway and frankly I'm not going to enable atime on any of them.

P.S. "Array1", "Array2", etc. are not reserved names, are they?