Hmm .. I think this would probably be better asked in the general discussion forum, but as a quick answer "Any filesystem that folks are prepared to write modules for" ...
Included in Solaris are UFS, NFS, PCFS (FAT), UDFS, HSFS, and a few more specialised ones such as tmpfs. There are almost certainly more, but these are the common ones I can think of from memory. This message posted from opensolaris.org
