Nfs, execution denied

I have server (debian 6) machine (say, ip = 10.13.13.100) with nfs exports

/etc/exports

 /path/to/my/shared/folder 10.13.13.0/24(rw,async,no_sub_tree_check,no_root_squash)

There are two users on this machine admin (uid = 1000) and user (uid = 1001)

on client machines (also debian 6) (say, ip = 10.13.13.111) i have
/etc/fstab

 10.13.13.100:/path/to/my/shared/folder /my/mount/point nfs rw,exec,user,owner 0 0

There is only one user (uid = 1000)

after reboot or mount -a, the shared folder is mounted successfully, but i can not execute any file on it (even if files have exec permissions). However, read and write for files on this file system works fine.