/usr/lib/linux-tools/4.15.0-15-lowlatency/usbip is in linux-tools-4.15.0-15-lowlatency 4.15.0-15.16~16.04.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.15.0-15-lowlatency/../../linux-hwe-edge-tools-4.15.0-15/usbip