I am not that much experienced but this is what I added to /usr/lib/armbian/armbian-truncate-logs
# truncate
/usr/bin/find /var/log -name '*.log' -or -name '*.xz' -or -name 'lastlog' -or -name 'messages' -or -name 'debug' -or -name 'sysl$
/usr/bin/find /var/log -name 'btmp' -or -name 'wtmp' -or -name 'faillog' -or -name 'firewalld' | xargs truncate --size 0 >/dev/n$
/usr/bin/find /var/log -name 'mail.err' -or -name 'mail.info' -or -name 'mail.warning' | xargs truncate --size 0 >/dev/null 2>&1
# I have added line below
/usr/bin/find /var/log/samba -name '*.log' -or -name 'log.*' | xargs truncate --size 0 >/dev/null 2>&1