/usr/share/go-1.6/src/mime/ is in golang-1.6-src 1.6.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/go-1.6/src/mime/encodedword.go
/usr/share/go-1.6/src/mime/encodedword_test.go
/usr/share/go-1.6/src/mime/example_test.go
/usr/share/go-1.6/src/mime/grammar.go
/usr/share/go-1.6/src/mime/mediatype.go
/usr/share/go-1.6/src/mime/mediatype_test.go
/usr/share/go-1.6/src/mime/multipart/
/usr/share/go-1.6/src/mime/multipart/example_test.go
/usr/share/go-1.6/src/mime/multipart/formdata.go
/usr/share/go-1.6/src/mime/multipart/formdata_test.go
/usr/share/go-1.6/src/mime/multipart/multipart.go
/usr/share/go-1.6/src/mime/multipart/multipart_test.go
/usr/share/go-1.6/src/mime/multipart/testdata/
/usr/share/go-1.6/src/mime/multipart/testdata/nested-mime
/usr/share/go-1.6/src/mime/multipart/writer.go
/usr/share/go-1.6/src/mime/multipart/writer_test.go
/usr/share/go-1.6/src/mime/quotedprintable/
/usr/share/go-1.6/src/mime/quotedprintable/reader.go
/usr/share/go-1.6/src/mime/quotedprintable/reader_test.go
/usr/share/go-1.6/src/mime/quotedprintable/writer.go
/usr/share/go-1.6/src/mime/quotedprintable/writer_test.go
/usr/share/go-1.6/src/mime/testdata/
/usr/share/go-1.6/src/mime/testdata/test.types
/usr/share/go-1.6/src/mime/testdata/test.types.plan9
/usr/share/go-1.6/src/mime/type.go
/usr/share/go-1.6/src/mime/type_dragonfly.go
/usr/share/go-1.6/src/mime/type_freebsd.go
/usr/share/go-1.6/src/mime/type_openbsd.go
/usr/share/go-1.6/src/mime/type_plan9.go
/usr/share/go-1.6/src/mime/type_test.go
/usr/share/go-1.6/src/mime/type_unix.go
/usr/share/go-1.6/src/mime/type_windows.go