linux - How to find biggest (in entries, not size) ext4 directory?

Ubuntu 10.04.3 LTS x86_64, I am seeing the following in
/var/log/messages:

EXT4-fs
            warning (device sda3): ext4_dx_add_entry: Directory index
            full!

Relevant info
from
dumpe2fs:

Filesystem
            features: has_journal ext_attr resize_inode dir_index filetype
 needs_recovery
            extent flex_bg sparse_super large_file huge_file uninit_bg
 dir_nlink
            extra_isize
Filesystem flags: signed_directory_hash
Free blocks:
            165479247
Free inodes: 454382328
Block size: 2048
Inode
            size:
            256

I've
already read some other questions, such as href="https://serverfault.com/questions/312445/ext3-dx-add-entry-directory-index-full">ext3_dx_add_entry:
Directory index full and href="https://serverfault.com/questions/183821/rm-on-a-directory-with-millions-of-files">rm
on a directory with millions of files; those made me think that there must be
a directory with a big number of items in it
somewhere.

Since it is a rather complex
directory organization I have a basic problem: how can I find the directory which is
generating those messages?

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