/usr/ is in ruby-rails-assets-jquery-placeholder 2.3.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/ruby/vendor_ruby/
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/rails-assets-jquery-placeholder.rb
/usr/lib/ruby/vendor_ruby/rails-assets-jquery-placeholder/
/usr/lib/ruby/vendor_ruby/rails-assets-jquery-placeholder/version.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/rails-assets-jquery-placeholder-2.3.1.gemspec
/usr/share/ruby-rails-assets-jquery-placeholder/
/usr/share/ruby-rails-assets-jquery-placeholder/app/
/usr/share/ruby-rails-assets-jquery-placeholder/app/assets/
/usr/share/ruby-rails-assets-jquery-placeholder/app/assets/javascripts/
/usr/share/ruby-rails-assets-jquery-placeholder/app/assets/javascripts/jquery-placeholder.js
/usr/share/ruby-rails-assets-jquery-placeholder/app/assets/javascripts/jquery-placeholder/
/usr/share/doc/
/usr/share/doc/ruby-rails-assets-jquery-placeholder/
/usr/share/doc/ruby-rails-assets-jquery-placeholder/copyright
/usr/share/ruby-rails-assets-jquery-placeholder/app/assets/javascripts/jquery-placeholder/jquery.placeholder.js
/usr/share/doc/ruby-rails-assets-jquery-placeholder/changelog.Debian.gz