Ask HN: Modern solution for fine grained access controls in file systems?

I have used NFSv4 ACLs extensively to manage permissions at a very granular level in file systems. However, I haven’t found a modern replacement for NFSv4 ACLs + NFS that I can use to mount in both Linux (and ideally also Windows) computers.

S3+S3FS supports only POSIX permissions, EFS does not support NFSv4 ACLs,