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#[cfg(unix)]
fn modified_time(&self, file: &str) -> Result<std::time::SystemTime, Self::Error> {
debug!("modified_time {:?}", file);
use std::os::unix::fs::MetadataExt;
let attr = std::fs::metadata(&self.path(file))?;
let ctime = std::time::SystemTime::UNIX_EPOCH + std::time::Duration::from_secs(attr.ctime() as u64);
Ok(attr.modified()?.min(ctime))
}