/usr/share/gocode/src/code.google.com/p/snappy-go is in golang-github-golang-snappy-dev 0.0+git20160529.d9eb7a3-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/gocode/src/code.google.com/p/../../github.com/golang/snappy