List out number of storage/volume drivers supported by docker

Overlay2 – preferred storage driver for all currently supported Linux distributions, and requires no extra configuration. fuse-overlayfs – preferred only for running Rootless Docker on a host that does not provide support for rootless overlay2 btrfs and zfs – The btrfs and zfs storage drivers allow for advanced options, such as creating “snapshots”, but require more maintenance and setup. Each of these relies on the backing filesystem being configured correctly Vfs –  Intended for testing purposes, and for situations where no copy-on-write filesystem can be used. Aufs

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