K8s mostly drops docker volumes code (and many other parts of docker, TBH). You can pass a random mount point or even a raw device and it will have only the ove

K8s mostly drops docker volumes code (and many other parts of docker, TBH). You can pass a random mount point or even a raw device and it will have only the overhead of kernel IO code for namespaces, overhead you hit anyway. The only "docker graph" stuff is in OCI container data itself.