Lock out root writes on mounted directory?

I've created a sandbox for building rpms. It was suggested to me that for
some directories, such as /bin, /lib, /sbin, I could mount them with ro,bind
options instead of coping or hard linking them. What I've discovered,
though, is that the ro mount option does not prohibit root from modifying a
mounted directory. Is there any way to mount a directory such that root
cannot write to it?
--
-Eric 'shubes'
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