Debian stretch hiberante hooks

[kjonca@poczta.onet.pl (Kamil Jońca)]

There is laptop with "stretch/sid" on it.
I want umount all remote filesysems before suspending/hibernating it.
When google I found only solutions referring to pm-utils and
/etc/pm/sleep.d sripts. But this does not work for me. It looks like
pm-hibernate is not even calling.
So my question is: how can I put script to run before hibernate? Or what
should I read?
KJ

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