The statfs system call might work for you. Under Linux the f_type encodes the type of file system. See the following links for more details:

In reply to Re: follow up to "http://www.perlmonks.org/?node_id=101209" NFS stuff by pc88mxer
in thread follow up to "http://www.perlmonks.org/?node_id=101209" NFS stuff by mikejones

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