Defining quota in CephFS - quota is ignored

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Hello!

Based on the documentation for defining quotas in CephFS for any directory (http://docs.ceph.com/docs/master/cephfs/quota/), I defined a quota for attribute max_bytes:
ld4257:~ # getfattr -n ceph.quota.max_bytes /mnt/ceph-fuse/MTY/
getfattr: Removing leading '/' from absolute path names
# file: mnt/ceph-fuse/MTY/
ceph.quota.max_bytes="100000000"

To validate if the quota is working, I write a 128MB file in /mnt/ceph-fuse/MTY:
ld4257:~ # dd if=/dev/zero of=/mnt/ceph-fuse/MTY/128MBfile bs=64M count=2
2+0 records in
2+0 records out
134217728 bytes (134 MB, 128 MiB) copied, 0.351206 s, 382 MB/s

This file is created correctly, and the utilization statistcs confirm it:
ld4257:~ # rados df
pool name                 KB      objects       clones     degraded      unfound           rd        rd KB           wr        wr KB
hdb-backup            131072           32            0            0            0            8            8        43251     88572586
hdb-backup_metadata        27920           27            0            0            0          301       168115         6459        55386
rbd                        0            0            0            0            0            0            0            0            0
templates                  0            0            0            0            0            0            0            0            0
  total used         9528188           59
  total avail   811829446772
  total space   811838974960


Question:
Why can I create a file with size 128MB after defining a quota of 100MB?


THX
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