Dummy password for LUKS?
 

I want to encrypt my entire hard drive with LUKS, and I was wondering if there was a false password implementation, like one password is real that if you type in, you get access to all the files, otherwise there is another password that is accepted that makes the partition appear to have "fake" files instead of the "real" files.

As far as I know, this doesn't exist - you either get in, or you don't. TrueCrypt has some info on their plausible deniability page about ways they hide encrypted information, but it's also not what you were asking about.