/usr/share/go-1.8/src/cmd/api/ is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/go-1.8/src/cmd/api/goapi.go
/usr/share/go-1.8/src/cmd/api/goapi_test.go
/usr/share/go-1.8/src/cmd/api/run.go
/usr/share/go-1.8/src/cmd/api/testdata/
/usr/share/go-1.8/src/cmd/api/testdata/src/
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p1/
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p1/golden.txt
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p1/p1.go
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p2/
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p2/golden.txt
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p2/p2.go
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p3/
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p3/golden.txt
/usr/share/go-1.8/src/cmd/api/testdata/src/pkg/p3/p3.go