Lofs or nfs for sharing filesystems

I'm trying to figure out if using lofs or nfs is better for sharing a filesystem from a global zone to several (five or more) non-global zones.
For example. I've got a filesystem d0 mounted under /zonedir where the zones reside. I'd like to create /zonedir/homes and share that as /home on the non-global zones.
I've had some success creating an NFS share on the global and then mounting it in the non-globals, but I can imagine that adds a lot of overhead running everything through the network stack and NFS services.
There's lofs, but couldn't there be issues with file locking?

the docs.sun.com manual specifically advises against mounting NFS filesystems between zones

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