On Centos 7; I had to grow a partition that had NFS server running on it. Since it was a production environment I could not stop the NFS server, grow the partition and the restart NFS server.
In fact, there is NO NEED to stop the NFS server when growing the XFS partition.
I am also running LVM so just extended the LV volume first after extending additional storage space to a volume and then just ran xfs_grow and the volume was extended within 2 seconds.
and the rest of the NFS clients immediately detected the partition size increase.