/usr/lib/linux-tools/4.4.0-63-lowlatency/usbipd is in linux-tools-4.4.0-63-lowlatency 4.4.0-63.84~14.04.2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/linux-tools/4.4.0-63-lowlatency/../../linux-lts-xenial-tools-4.4.0-63/usbipd