fuse_backend_rs::api::filesystem::Layer is not exposed for non-Linux, and
feature-flagged on virtiofs, so only implement the trait for these cases.
Change-Id: Id8455dc5be502f8375836ba04288d50c59d69d89
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12693
Reviewed-by: Ilan Joselevich <personal@ilanjoselevich.com>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI