/usr/ is in ruby-net-sftp 1:2.1.2-3.
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/net/
/usr/lib/ruby/vendor_ruby/net/sftp/
/usr/lib/ruby/vendor_ruby/net/sftp/response.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol.rb
/usr/lib/ruby/vendor_ruby/net/sftp/request.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/01/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/01/name.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/01/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/01/attributes.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/06/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/06/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/06/attributes.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/05/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/05/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/03/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/03/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/04/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/04/name.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/04/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/04/attributes.rb
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/02/
/usr/lib/ruby/vendor_ruby/net/sftp/protocol/02/base.rb
/usr/lib/ruby/vendor_ruby/net/sftp/packet.rb
/usr/lib/ruby/vendor_ruby/net/sftp/constants.rb
/usr/lib/ruby/vendor_ruby/net/sftp/errors.rb
/usr/lib/ruby/vendor_ruby/net/sftp/operations/
/usr/lib/ruby/vendor_ruby/net/sftp/operations/file_factory.rb
/usr/lib/ruby/vendor_ruby/net/sftp/operations/upload.rb
/usr/lib/ruby/vendor_ruby/net/sftp/operations/download.rb
/usr/lib/ruby/vendor_ruby/net/sftp/operations/file.rb
/usr/lib/ruby/vendor_ruby/net/sftp/operations/dir.rb
/usr/lib/ruby/vendor_ruby/net/sftp/version.rb
/usr/lib/ruby/vendor_ruby/net/sftp/session.rb
/usr/lib/ruby/vendor_ruby/net/sftp.rb
/usr/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/net-sftp-2.1.2.gemspec
/usr/share/doc/
/usr/share/doc/ruby-net-sftp/
/usr/share/doc/ruby-net-sftp/changelog.Debian.gz
/usr/share/doc/ruby-net-sftp/changelog.gz
/usr/share/doc/ruby-net-sftp/copyright
/usr/share/doc/ruby-net-sftp/README.rdoc.gz