/usr/ is in ruby-gio2 3.1.0-1+deb9u1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/gio2/
/usr/lib/x86_64-linux-gnu/ruby/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/gio2/action-map.rb
/usr/lib/ruby/vendor_ruby/gio2/action.rb
/usr/lib/ruby/vendor_ruby/gio2/application-command-line.rb
/usr/lib/ruby/vendor_ruby/gio2/content-type.rb
/usr/lib/ruby/vendor_ruby/gio2/deprecated.rb
/usr/lib/ruby/vendor_ruby/gio2/file.rb
/usr/lib/ruby/vendor_ruby/gio2/inet-address.rb
/usr/lib/ruby/vendor_ruby/gio2/input-stream.rb
/usr/lib/ruby/vendor_ruby/gio2/loader.rb
/usr/lib/ruby/vendor_ruby/gio2/pollable-input-stream.rb
/usr/lib/ruby/vendor_ruby/gio2/pollable-output-stream.rb
/usr/lib/ruby/vendor_ruby/gio2/resources.rb
/usr/lib/ruby/vendor_ruby/gio2/settings-schema-source.rb
/usr/lib/ruby/vendor_ruby/gio2/settings.rb
/usr/lib/ruby/vendor_ruby/gio2/simple-action.rb
/usr/lib/ruby/vendor_ruby/gio2.rb
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/
/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/2.3.0/gio2.so
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-gio2/
/usr/share/doc/ruby-gio2/changelog.Debian.gz
/usr/share/doc/ruby-gio2/copyright