Timestamp of a file in Gluster volume inconsistent between clients

Issue

• File stat shows different timestamp between clients

[root@client1 ~]# stat /mnt/file
  File: ‘/mnt/file’
  Size: 10              Blocks: 1          IO Block: 131072 regular file
Device: 26h/38d Inode: 13064079041216222550  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Context: system_u:object_r:fusefs_t:s0
Access: 2017-08-04 14:59:33.568866094 +0900
Modify: 2017-08-04 14:59:33.571866094 +0900
Change: 2017-08-04 14:59:33.587866094 +0900
 Birth: -

[root@client2 ~]# stat /mnt/file
  File: ‘/mnt/file’
  Size: 10              Blocks: 1          IO Block: 131072 regular file
Device: 28h/40d Inode: 13064079041216222550  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Context: system_u:object_r:fusefs_t:s0
Access: 2017-08-04 14:59:33.569254404 +0900
Modify: 2017-08-04 14:59:33.571254404 +0900
Change: 2017-08-04 14:59:33.588254404 +0900
 Birth: -