How to find PIDs associated with a specific mount point or directory?

[root@server1 ~]# lsof +D /tmp 
COMMAND    PID USER   FD   TYPE             DEVICE SIZE/OFF  NODE NAME
Xorg      2145 root    3u  unix 0xffff880037a00380      0t0 13160 /tmp/.X11-unix/X0
gnome-ses 2231  gdm    8u  unix 0xffff8800d6c05680      0t0 13424 /tmp/.ICE-unix/2231
gnome-ses 2231  gdm   17u  unix 0xffff88007f916080      0t0 13552 /tmp/orbit-gdm/linc-8b7-0-aa1e644ce7ad
gnome-ses 2231  gdm   18u  unix 0xffff88007f917980      0t0 13555 /tmp/orbit-gdm/linc-8b7-0-aa1e644ce7ad
gnome-ses 2231  gdm   23u  unix 0xffff88007f971380      0t0 13800 /tmp/orbit-gdm/linc-8b7-0-aa1e644ce7ad
gconfd-2  2239  gdm   11u  unix 0xffff88007d592380      0t0 13484 /tmp/orbit-gdm/linc-8bf-0-606984a4c9463
gconfd-2  2239  gdm   15u  unix 0xffff88007f916380      0t0 13551 /tmp/orbit-gdm/linc-8bf-0-606984a4c9463
gconfd-2  2239  gdm   17u  unix 0xffff8800d7331c80      0t0 13653 /tmp/orbit-gdm/linc-8bf-0-606984a4c9463
gconfd-2  2239  gdm   19u  unix 0xffff8800d959e680      0t0 13810 /tmp/orbit-gdm/linc-8bf-0-606984a4c9463
gconfd-2  2239  gdm   21u  unix 0xffff880046d18980      0t0 14068 /tmp/orbit-gdm/linc-8bf-0-606984a4c9463
gconfd-2  2239  gdm   23u  unix 0xffff8800468f7080      0t0 14127 /tmp/orbit-gdm/linc-8bf-0-606984a4c9463
at-spi-re 2253  gdm   11u  unix 0xffff88007f937080      0t0 13739 /tmp/orbit-gdm/linc-8cd-0-148cfa3815bdc
at-spi-re 2253  gdm   12u  unix 0xffff88000a128980      0t0 13743 /tmp/orbit-gdm/linc-8cd-0-148cfa3815bdc
at-spi-re 2253  gdm   14u  unix 0xffff8800d95a6680      0t0 13782 /tmp/orbit-gdm/linc-8cd-0-148cfa3815bdc