It seems not…
If you are OK with using python from Julia you could probably use:
julia> using PyCall
julia> @pyimport shutil
julia> shutil.disk_usage("/")
If you like to play with lower level (see doc) you could write something similar to:
julia> function disk_free_space(path)
if Sys.islinux() # maybe isunix would work here too?
statfs = zeros(UInt64, 11) # warning: I am not sure all platform use unsigned long for all fields. See `man statvfs`
ccall((:statvfs, "libm.so.6"), Cint, (Cstring,Ptr{Cvoid}), "/", statfs)
convert(Int, statfs[1]*statfs[5])
elseif Sys.iswindows()
# you could call GetDiskFreeSpaceExA from kernel32.dll
# something like ->
# ccall( (:GetDiskFreeSpaceExA, "kernel32.dll"), stdcall, ... )
# sry I have no windows to try
else throw(ErrorException("Unsupported platform"))
end
end