Why docker-storage-setup doesn't create thin pool for overlayfs driver?

Seen from the docker-storage-setup code(https://raw.githubusercontent.com/projectatomic/docker-storage-setup/master/docker-storage-setup.sh), docker-storage-setup will create thin pool(docker-pool) and enable_auto_pool_extension with devicemapper driver, but not do that with overlayfs driver. Is it the matter of Docker or the file system(overlay) itself which confilts with lvm?

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