/etc/modprobe.d/garmin-forerunner-tools.conf is in garmin-forerunner-tools 0.10repacked-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # garmin_gps gets in the way of forerunner-tools
blacklist garmin_gps
|