/usr/ is in golang-github-golang-groupcache-dev 0.0~git20150125.0.604ed57-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/
/usr/share/gocode/
/usr/share/gocode/src/
/usr/share/gocode/src/github.com/
/usr/share/gocode/src/github.com/golang/
/usr/share/gocode/src/github.com/golang/groupcache/
/usr/share/gocode/src/github.com/golang/groupcache/singleflight/
/usr/share/gocode/src/github.com/golang/groupcache/singleflight/singleflight.go
/usr/share/gocode/src/github.com/golang/groupcache/singleflight/singleflight_test.go
/usr/share/gocode/src/github.com/golang/groupcache/testpb/
/usr/share/gocode/src/github.com/golang/groupcache/testpb/test.proto
/usr/share/gocode/src/github.com/golang/groupcache/testpb/test.pb.go
/usr/share/gocode/src/github.com/golang/groupcache/byteview.go
/usr/share/gocode/src/github.com/golang/groupcache/consistenthash/
/usr/share/gocode/src/github.com/golang/groupcache/consistenthash/consistenthash_test.go
/usr/share/gocode/src/github.com/golang/groupcache/consistenthash/consistenthash.go
/usr/share/gocode/src/github.com/golang/groupcache/lru/
/usr/share/gocode/src/github.com/golang/groupcache/lru/lru_test.go
/usr/share/gocode/src/github.com/golang/groupcache/lru/lru.go
/usr/share/gocode/src/github.com/golang/groupcache/http.go
/usr/share/gocode/src/github.com/golang/groupcache/peers.go
/usr/share/gocode/src/github.com/golang/groupcache/groupcache.go
/usr/share/gocode/src/github.com/golang/groupcache/sinks.go
/usr/share/gocode/src/github.com/golang/groupcache/http_test.go
/usr/share/gocode/src/github.com/golang/groupcache/groupcachepb/
/usr/share/gocode/src/github.com/golang/groupcache/groupcachepb/groupcache.pb.go
/usr/share/gocode/src/github.com/golang/groupcache/groupcachepb/groupcache.proto
/usr/share/gocode/src/github.com/golang/groupcache/groupcache_test.go
/usr/share/gocode/src/github.com/golang/groupcache/byteview_test.go
/usr/share/doc/
/usr/share/doc/golang-github-golang-groupcache-dev/
/usr/share/doc/golang-github-golang-groupcache-dev/changelog.Debian.gz
/usr/share/doc/golang-github-golang-groupcache-dev/copyright
/usr/share/doc/golang-github-golang-groupcache-dev/README.md