[$] An overlayfs update

In a shortened session in the filesystem track at the 2026 Linux Storage,Filesystem, Memory Management, and BPF Summit, Amir Goldstein gave anupdate on the overlayfsunion filesystem. There are some new features over the last few yearsthat he wanted to mention, along with looking at the status of nestingoverlayfs layers. The composefs use casethat was discussed at the summit in 2023has led to some interesting changes to overlayfs.