[collectd] df plugin replaces / with - how to get original partition name?

[O G]

Hello,
 
I'm starting to use the 'df' plugin to detect free/used disk space, and I noticed that partition names get converted from for example /var/lib to var-lib.  Because this "var-lib" ends up being a part of the filename, I understand why the file name cannot use "/var/lib".
 
But I'm wondering if there is some way to get the original name of the partition?
I could just convert all dashes to slashes, but that would break things in case there is a partion that's really named /var/foo-bar for example.
 
How do others deal with this?
Any tips would be appreciated!
 
Thanks,
Otis
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