/usr/ is in ruby-guard-compat 1.2.1-1.
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/guard/
/usr/lib/ruby/vendor_ruby/guard/compat/
/usr/lib/ruby/vendor_ruby/guard/compat/example.rb
/usr/lib/ruby/vendor_ruby/guard/compat/plugin.rb
/usr/lib/ruby/vendor_ruby/guard/compat/test/
/usr/lib/ruby/vendor_ruby/guard/compat/test/helper.rb
/usr/lib/ruby/vendor_ruby/guard/compat/test/template.rb
/usr/lib/ruby/vendor_ruby/guard/compat/version.rb
/usr/lib/ruby/vendor_ruby/guard/compat.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-guard-compat/
/usr/share/doc/ruby-guard-compat/README.md
/usr/share/doc/ruby-guard-compat/changelog.Debian.gz
/usr/share/doc/ruby-guard-compat/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/guard-compat-1.2.1.gemspec