/usr/ is in ruby-fssm 0.2.10-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/fssm/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/fssm/version.rb
/usr/lib/ruby/vendor_ruby/fssm/tree.rb
/usr/lib/ruby/vendor_ruby/fssm/backends/
/usr/lib/ruby/vendor_ruby/fssm/backends/polling.rb
/usr/lib/ruby/vendor_ruby/fssm/backends/rbfsevent.rb
/usr/lib/ruby/vendor_ruby/fssm/backends/inotify.rb
/usr/lib/ruby/vendor_ruby/fssm/path.rb
/usr/lib/ruby/vendor_ruby/fssm/state/
/usr/lib/ruby/vendor_ruby/fssm/state/directory.rb
/usr/lib/ruby/vendor_ruby/fssm/state/file.rb
/usr/lib/ruby/vendor_ruby/fssm/support.rb
/usr/lib/ruby/vendor_ruby/fssm/pathname.rb
/usr/lib/ruby/vendor_ruby/fssm/monitor.rb
/usr/lib/ruby/vendor_ruby/fssm.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/fssm-0.2.10.gemspec
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/fssm-0.2.10.gemspec
/usr/share/doc/
/usr/share/doc/ruby-fssm/
/usr/share/doc/ruby-fssm/README.markdown
/usr/share/doc/ruby-fssm/changelog.Debian.gz
/usr/share/doc/ruby-fssm/examples/
/usr/share/doc/ruby-fssm/examples/example.rb
/usr/share/doc/ruby-fssm/copyright