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 ext3_dx_add_entry: Directory index full and 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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