FreeBSD and Linux shared partitions

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http://unix.stackexchange.com – Which directories, and how, can I share between FreeBSD and Linux? In particular, how can I deduplicate respectively /usr/home and /home? I guess directly sharing a partition between both systems could lead to conflicting dotfiles, so that may not be the right solution. Is union-mounting the shared partition reasonable? This way, I could move the dotfiles into the "/" partition of each OS, and share the rest of the files into the shared partition. Which filesystem should I use for the shared home partition itself? I have under 2GB RAM so I don't think ZFS will behave, from what I've read. May (HowTos)