| tmpfs || tar + gzip || Contains contents of tmpfs filesystem
| tmpfs || tar + gzip || Contains contents of tmpfs filesystem
|}
|}
+
+
== Notes about protobuf ==
+
;We have a registered field number(1018) for [https://developers.google.com/protocol-buffers/docs/proto#options custom options] of all kinds. See protobuf/opts.proto for more info.