/usr/share/ is in golang-mux-dev 0.0~git20151003.1.ad4d7a5-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/
/usr/share/gocode/src/
/usr/share/gocode/src/github.com/
/usr/share/gocode/src/github.com/gorilla/
/usr/share/gocode/src/github.com/gorilla/mux/
/usr/share/gocode/src/github.com/gorilla/mux/old_test.go
/usr/share/gocode/src/github.com/gorilla/mux/route.go
/usr/share/gocode/src/github.com/gorilla/mux/mux_test.go
/usr/share/gocode/src/github.com/gorilla/mux/bench_test.go
/usr/share/gocode/src/github.com/gorilla/mux/regexp.go
/usr/share/gocode/src/github.com/gorilla/mux/doc.go
/usr/share/gocode/src/github.com/gorilla/mux/mux.go
/usr/share/doc/
/usr/share/doc/golang-mux-dev/
/usr/share/doc/golang-mux-dev/README.md.gz
/usr/share/doc/golang-mux-dev/copyright
/usr/share/doc/golang-mux-dev/changelog.Debian.gz