Cody Goodman <codygman.consulting@gmail.com> schrieb am Di., 9. Okt. 2018 um 19:04 Uhr:

              :filter #'(apply-partially 'my-pass-it-on-filter "/tmp/mytmp")


This should work if you leave out the quoting, i.e.

 :filter (apply-partially 'my-pass-it-on-filter "/tmp/mytmp")