ocis: Adding collaborators doesn't work in docker on mac

Steps to reproduce

• Use owncloud/ocis:1.0.0-beta2
• Mount /var/tmp/reva/data to the outside
• Try to add a collaborator
• Popup with error message “grpc error”

Log

ocis_1   | 10:44AM ERR srv/app/pkg/mod/github.com/cs3org/reva@v0.1.1-0.20200320145721-40c4334849c3/internal/grpc/services/storageprovider/storageprovider.go:675 > error setting ACL error="xattr.Set /var/tmp/reva/data/einstein/files/Goethe_(Stieler_1828).jpg user.oc.acl.u:marie: operation not supported" pid=56 pkg=rgrpc traceid=3227113cc371ffc11b650727f6cd9b75
ocis_1   | 10:44AM INF srv/app/pkg/mod/github.com/cs3org/reva@v0.1.1-0.20200320145721-40c4334849c3/internal/grpc/interceptors/log/log.go:69 > unary code=OK end="01/Apr/2020:10:44:10 +0000" from=tcp://127.0.0.1:57360 pid=56 pkg=rgrpc start="01/Apr/2020:10:44:10 +0000" time_ns=2839900 traceid=3227113cc371ffc11b650727f6cd9b75 uri=/cs3.storage.provider.v1beta1.ProviderAPI/AddGrant user-agent=grpc-go/1.26.0
ocis_1   | 10:44AM ERR srv/app/pkg/mod/github.com/cs3org/reva@v0.1.1-0.20200320145721-40c4334849c3/internal/grpc/services/gateway/usershareprovider.go:91 > error committing share to storage grant error="gateway: grpc failed with code CODE_INTERNAL" pid=205 pkg=rgrpc traceid=3227113cc371ffc11b650727f6cd9b75
ocis_1   | 10:44AM INF srv/app/pkg/mod/github.com/cs3org/reva@v0.1.1-0.20200320145721-40c4334849c3/internal/grpc/interceptors/log/log.go:69 > unary code=OK end="01/Apr/2020:10:44:10 +0000" from=tcp://127.0.0.1:35660 pid=205 pkg=rgrpc start="01/Apr/2020:10:44:10 +0000" time_ns=10421700 traceid=3227113cc371ffc11b650727f6cd9b75 uri=/cs3.gateway.v1beta1.GatewayAPI/CreateShare user-agent=grpc-go/1.26.0

Reason

Create bind mount

docker run -i -v /Users/mbarz/Development:/root/tmp -t owncloud/base /bin/bash

List the mounts

overlay on / type overlay (rw,relatime,lowerdir=/var/lib/docker/overlay2/l/PTYN5X4ICYATB3PXAWTOS6LOX7:/var/lib/docker/overlay2/l/63FNL6Z76ABXDNAJIEOZ7GSMIQ:/var/lib/docker/overlay2/l/BMJYLZJXTRT3RQKQRPCKKMVPEI:/var/lib/docker/overlay2/l/C5GZ7ZIKWO3S7MG67SXNAIDEE5:/var/lib/docker/overlay2
shm on /dev/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=65536k)
osxfs on /root/tmp type fuse.osxfs (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other,max_read=1048576)
/dev/vda1 on /mnt/data type ext4 (rw,relatime)

• osxfs is used for the bind mount
• No support for extended attributes https://docs.docker.com/docker-for-mac/osxfs/

Try to create some attributes

touch /root/tmp/tt; setfattr -n user.name -v value /root/tmp/tt; getfattr -d /root/tmp/tt
setfattr: /root/tmp/tt: Operation not supported
getfattr: /root/tmp/tt: Operation not supported