[root@x01 releases]# lsof +D /releases/20150515205357/public/
COMMAND   PID           USER   FD   TYPE DEVICE SIZE/OFF    NODE NAME
nginx    2202          nginx   23r   REG   0,21        0 3675669 /releases/20150515205357/public/.nfs000000000038161500000004


[root@dx01 releases]# strace -p 2202

Process 2203 attached - interrupt to quit
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0
epoll_wait(16, {}, 512, 500)            = 0