/usr/ is in ruby-parsetree 3.0.8-2ubuntu1.
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/parse_tree_extensions.rb
/usr/lib/ruby/vendor_ruby/gauntlet_parsetree.rb
/usr/lib/ruby/vendor_ruby/unified_ruby.rb
/usr/lib/ruby/vendor_ruby/parse_tree.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-parsetree/
/usr/share/doc/ruby-parsetree/README.txt
/usr/share/doc/ruby-parsetree/README.Debian
/usr/share/doc/ruby-parsetree/TODO.Debian
/usr/share/doc/ruby-parsetree/copyright
/usr/share/doc/ruby-parsetree/examples/
/usr/share/doc/ruby-parsetree/examples/parse_tree_abc
/usr/share/doc/ruby-parsetree/examples/parse_tree_audit
/usr/share/doc/ruby-parsetree/examples/parse_tree_deps
/usr/share/doc/ruby-parsetree/examples/parse_tree_show
/usr/share/doc/ruby-parsetree/changelog.Debian.gz