/usr/ is in ruby-glib2 3.1.0-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/glib2/
/usr/lib/ruby/vendor_ruby/glib2/deprecatable.rb
/usr/lib/ruby/vendor_ruby/glib2/regex.rb
/usr/lib/ruby/vendor_ruby/glib2/version.rb
/usr/lib/ruby/vendor_ruby/glib2.rb
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/glib2.so
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-glib2/
/usr/share/doc/ruby-glib2/changelog.Debian.gz
/usr/share/doc/ruby-glib2/copyright
/usr/share/doc/ruby-glib2/examples/
/usr/share/doc/ruby-glib2/examples/bookmarkfile.rb
/usr/share/doc/ruby-glib2/examples/idle.rb
/usr/share/doc/ruby-glib2/examples/iochannel.rb
/usr/share/doc/ruby-glib2/examples/keyfile.rb
/usr/share/doc/ruby-glib2/examples/shell.rb
/usr/share/doc/ruby-glib2/examples/spawn.rb
/usr/share/doc/ruby-glib2/examples/timeout.rb
/usr/share/doc/ruby-glib2/examples/timeout2.rb
/usr/share/doc/ruby-glib2/examples/timer.rb
/usr/share/doc/ruby-glib2/examples/type-register.rb
/usr/share/doc/ruby-glib2/examples/type-register2.rb
/usr/share/doc/ruby-glib2/examples/utils.rb