I am not sure about Keith's suggestion. In theory it should work but since you said that these users from the NT world are equivlent to root and they are still admins in the NT Domain the filer resides in (which they probably are) I believe they would still be able to open server manager on the Filer. I am not positive but I think this could be the case.
Also I believe that as long as these NT admins have change access to these directories/files they could be able to share it anyway. Keep in mind that even if you find a way to disable server manager, with the correct rights (which in your scenerio I believe they would have)NT admins still have a variety of command line ways of administering this data if they want to.
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