/usr/share/ is in golang-gopkg-macaroon.v1-dev 0.0~git20150121.0.ab3940c-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gocode/src/
/usr/share/gocode/src/gopkg.in/
/usr/share/gocode/src/gopkg.in/macaroon.v1/
/usr/share/doc/
/usr/share/doc/golang-gopkg-macaroon.v1-dev/
/usr/share/doc/golang-gopkg-macaroon.v1-dev/changelog.Debian.gz
/usr/share/doc/golang-gopkg-macaroon.v1-dev/copyright
/usr/share/gocode/
/usr/share/gocode/src/gopkg.in/macaroon.v1/bench_test.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/crypto.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/crypto_test.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/export_test.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/macaroon.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/macaroon_test.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/marshal.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/marshal_test.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/packet.go
/usr/share/gocode/src/gopkg.in/macaroon.v1/packet_test.go