relstorage: shared-blob-dir option clarification docs vs src

Hi.

I was under the impression that if shared-blob-dir is false that blob-dir
must be unique across clients.
In fact the docs say this:

shared-blob-dir

If true (the default), the blob directory is assumed to be shared among all
clients using NFS or similar; blob data will be stored only on the
filesystem and not in the database. If false, blob data is stored in the
relational database and the blob directory holds a cache of blobs.

When this option is false, the blob directory should not be shared among
clients.

But then I was wondering, "huh, thats odd, why?  zc.lockfile is used" and I
looked at the source and found this:

https://github.com/zodb/relstorage/blob/master/relstorage/blobhelper.py#L123
        # OK, it's not here and we (or someone) needs to get it.  We
        # want to avoid getting it multiple times.  We want to avoid
        # getting it multiple times even accross separate client
        # processes on the same machine. We'll use file locking.


So I wanted to ask the list for clarification:

Can clients safely share a `blob-dir` path if `shared-blob-dir` is false?

thanks
alan

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