How to get UNIX sort order in the Thunar File Manager?

[Jeffery Small]

Running Ubuntu 13.10 64-bit on an ASUS U56E

I want to get files and directories within Thunar to display in standard
UNIX sorting order, with uppercase directories appearing before lowercase
directories, and the same for files.  In other words, what I get is:

bin
Desktop
Documents
lib
Other
pc

when what I want is:

Desktop
Documents
Other
bin
lib
pc


My locale is set to:

LANG=en_US.UTF-8
LANGUAGE=en_US
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE=C
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES=C
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

I have tried setting all LC_ variables to "en_US.UTF-8", "C" and "POSIX",
without any change in behavior within Thunar.  (Logged out/in and checked
locale after each change.)

Any suggestion as to how I can achieve the desired result?  Thanks.