Where are CUPS backend scripts and filters stored on Mac OS X? Where are CUPS backend scripts and filters stored on Mac OS X?

On linux they are in /usr/lib/cups/backend, but I can't find them on Mac OS x
/usr/libexec/cups/backend
/usr/libexec/cups/filter
... etc


Source: https://developer.apple.com/library/mac/documentation/Darwin/Reference/Manpages/man8/cups-deviced.8.html (mirror)