Docker run --device-read-bps option not working?

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Hello,
I’m trying to use the --device-read-bps option but it doesn’t seem to work (or I’m doing it wrong ?)

$ docker run -it --device-read-bps=/dev/nvme0n1p7:2mb ubuntu
docker: Error response from daemon: OCI runtime create failed: container_linux.go:348: starting container process caused "process_linux.go:402: container init caused \"process_linux.go:367: setting cgroup config for procHooks process caused \\\"failed to write 259:7 2097152 to blkio.throttle.read_bps_device: write /sys/fs/cgroup/blkio/docker/df9d7624a9e9adb3dda0b8ca82df0140118c89f9ee214195abb0edef45b2284b/blkio.throttle.read_bps_device: no such device\\\"\"": unknown.

$ df -P . | awk 'END{print $1}'
/dev/nvme0n1p7

$ docker -v
Docker version 18.06.1-ce, build e68fc7a

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.1 LTS
Release:	18.04
Codename:	bionic

Any idea about what is going on here ?
Thanks.

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