TODO

[kojix2]

Done	Test	N/A	Description
[x]	[ ]	[ ]	Consider the difference between file size and disk usage to accurately estimate disk usage.
[x]	[x]	[ ]	Fix the issue of hard links being double-counted in disk usage calculations.
[x]	[ ]	[ ]	Use std::os::linux instead of std::os::unix or explicitly document the reliance on POSIX-compliant features.
[ ]	[ ]	[x]	Use the stat system call to retrieve relevant volume information, such as device ID and filesystem size.
[ ]	[ ]	[x]	Evaluate alternatives to sysinfo for better compatibility with older Linux environments.
[x]	[ ]	[ ]	Fix the get_volume_info function to ensure it returns the correct volume information for the specified path.
[x]	[ ]	[ ]	Introduce an XML output library to avoid formatting errors and eliminate the need for a custom xml_escape implementation.
[ ]	[ ]	[ ]	Test the behavior with symbolic links, hard links, and overlapping mount points.
[ ]	[ ]	[ ]	Validate the format and content of the generated XML output.
[ ]	[ ]	[ ]	Test the behavior of options when multiple device IDs are present.
[ ]	[ ]	[ ]	Add unit tests to improve test coverage and ensure reproducibility.
[ ]	[ ]	[ ]	Use mocks to ensure reproducibility in system-dependent tests.
[ ]	[ ]	[ ]	Refactor the code to improve readability and increase resilience to future changes.