I believe that you can moderate this in the ops.json file of your server.

Go to your server's CraftBukkit, Spigot folder (or whatever its running). You should see the ops.json file. My Minecraft username is mukulibukuli and the way to put an op into the file is like this:

[ { "uuid": "22bfd181-b46d-4772-86d1-fc13ac7a09b2", "name": "mukulibukuli", "level": 1, "bypassesPlayerLimit": false } ] 

The lower the level the higher permissions you get (lowest level is 1). You can find your UUID on namemc.com, enter your Minecraft username to find it.

I really wish they could add a <level> part of the "/op name". If it could look like "/op name, level" that would be awesome!