Timeshift exclude directory with filter over command line

[fugbixer]

Is your feature request related to a problem? Please describe.
Having too less space and the data is not important for being part of the backup

Describe the solution you'd like
timeshift exclude directory with filter over command line
filter management over command line would be very beneficial
if its somehow possible already to do than please add it in the man page and / or the --help section

#288

please man page and help section
also add an example to /etc/timeshift.json

Thanks.