/usr/ is in ruby-acts-as-tree 2.4.0-1.
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/acts_as_tree/
/usr/lib/ruby/vendor_ruby/acts_as_tree/active_record/
/usr/lib/ruby/vendor_ruby/acts_as_tree/active_record/acts/
/usr/lib/ruby/vendor_ruby/acts_as_tree/active_record/acts/tree.rb
/usr/lib/ruby/vendor_ruby/acts_as_tree/railtie.rb
/usr/lib/ruby/vendor_ruby/acts_as_tree/version.rb
/usr/lib/ruby/vendor_ruby/acts_as_tree.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-acts-as-tree/
/usr/share/doc/ruby-acts-as-tree/README.md.gz
/usr/share/doc/ruby-acts-as-tree/changelog.Debian.gz
/usr/share/doc/ruby-acts-as-tree/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/acts_as_tree-2.4.0.gemspec