This little script shows the list of open files, preceeding each of them not only with PID as in original smbstatus, but with username too.
#!/usr/bin/perl -w
for (`smbstatus`) {
        $users{$1} = $2 if (/\s*(\d+)\s+(.+?)\s+(.+)\s{2}(.+)\s\((.+)\
+)/);
        print "$1($users{$1}) = $2\n" if (/(\d+).*?\/data\/dat\/(.*)\s
+{3}/);
}

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