ooks like you also have a deeper problem.
"Cluster size is zero" does not sound good, i.e. your space on your first partition is zero or not available at all.

Here is my output (with -n instead -af, just checking, no changes):
$ sudo fsck /dev/mmcblk0p1 -n
fsck 1.41.3.maemo0 (12-Oct-2008)
dosfsck 2.11, 12 Mar 2005, FAT32, LFN
/dev/mmcblk0p1: 21384 files, 442377/442377 clusters

Check partitions with
sfdisk - l

Did you reboot?
Sorry for not being helpful, but I do not know more at this stage.

--edit
Oh, and mounting should work with your commandor even
moumt /dev/mmcblk0p1
or
mount /home/user/MyDocs
as they are in /etc/fstab. I use these and have no problems.